{"id":24100,"date":"2026-01-19T09:06:31","date_gmt":"2026-01-19T09:06:31","guid":{"rendered":"https:\/\/1-grid.com\/knowledge\/how-to-fix-cannot-verify-server-identity-error\/"},"modified":"2026-01-19T09:06:33","modified_gmt":"2026-01-19T09:06:33","slug":"how-to-fix-cannot-verify-server-identity-error","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/how-to-fix-cannot-verify-server-identity-error\/","title":{"rendered":"How to Fix the \u201cCannot Verify Server Identity\u201d Error"},"content":{"rendered":"\n<p>The&nbsp;<strong>\u201cCannot Verify Server Identity\u201d<\/strong>&nbsp;error typically appears when an email app or device cannot confirm the security certificate of the server it is trying to connect to.&nbsp;While the message may feel alarming, it is actually a&nbsp;<strong>protective security feature<\/strong>&nbsp;designed to prevent your data from being intercepted or compromised.&nbsp;<\/p>\n\n\n\n<p>This error is\u00a0<strong>most commonly seen\u00a0on<\/strong>:\u00a0<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-ios-and-ipados-devices\">iOS and iPadOS devices\u00a0<\/li>\n\n\n\n<li id=\"htoc-macos-mail\">macOS Mail\u00a0<\/li>\n\n\n\n<li id=\"htoc-microsoft-outlook\">Microsoft Outlook\u00a0<\/li>\n\n\n\n<li id=\"htoc-other-email-clients-using-imap-smtp-or-exchange\">Other email clients using<strong>\u00a0<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-the-difference-between-imap-and-pop\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>IMAP<\/strong><\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Simple_Mail_Transfer_Protocol\"><strong>SMTP<\/strong><\/a>, or<strong> <a href=\"https:\/\/www.google.com\/aclk?sa=L&amp;ai=DChsSEwi7yN6XlJeSAxV5olAGHUelEJAYACICCAEQABoCZGc&amp;ae=2&amp;aspm=1&amp;co=1&amp;ase=2&amp;gclid=CjwKCAiAybfLBhAjEiwAI0mBBnqTGvXdJIh9pUi1FjmGhSJLTQnXFBzb4gMZrRQ7_T_xyOSDBQz5whoCQV0QAvD_BwE&amp;cid=CAASuwHkaAPxVvyT6iu47-2fqrw9t4DUUIGD67KQbEcgaCcHZMBHghC9c5zc5OM7lbOQcdg2wKzQLHBVYhv5XtQLlvy0fyD8pJDYWTlpgsdhfGspcfIAiVzUR-g91lfXXhmNnXBll2rCHglgI4I5RCtxOMEuKLVEhEhkAQ5gXgMvdhm4OCWaFGtiY019msezHivTi3D-0IW6N9icJhyeF7bxnw35N1DVX2y-YeKaIsUr2i5kfSCyX-BGvWgx2hDF&amp;cce=2&amp;category=acrcp_v1_35&amp;sig=AOD64_0tPn5CO_uU65CG7WWBMnKdpm0tGA&amp;q&amp;nis=4&amp;adurl&amp;ved=2ahUKEwii8tiXlJeSAxWuXEEAHbx8ELAQ0Qx6BAghEAE\">Exchange\u00a0<\/a><\/strong><\/li>\n<\/ul>\n\n\n\n<p>In most cases, the issue is caused by\u00a0<strong><a href=\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/\">certificate mismatches<\/a>, expired <a href=\"https:\/\/1grid.co.za\/website-security\/ssl\/\">SSL certificates<\/a>, incorrect server settings, or recent server changes\u00a0<\/strong>and can be resolved safely.\u00a0<\/p>\n\n\n\n<p>In this guide,&nbsp;we\u2019ll&nbsp;cover why the error occurs, step-by-step troubleshooting for users, advanced fixes for server administrators, and best practices to prevent future SSL\/TLS issues.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"600\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2022\/02\/1-grid-Images-for-KB-Articles-1000-x-600-px-14-1.png\" alt=\"How to Fix the \u201cCannot Verify Server Identity\u201d Error \" class=\"wp-image-34120\"\/><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-ht-block-toc is-style-rounded htoc htoc--position-wide toc-list-style-plain\" data-htoc-state=\"expanded\"><span class=\"htoc__title\"><span class=\"ht_toc_title\">Table of Contents<\/span><span class=\"htoc__toggle\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\"><g fill=\"#444\"><path d=\"M15 7H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><path d=\"M15 1H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1zM15 13H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><\/g><\/svg><\/span><\/span><div class=\"htoc__itemswrap\"><ul class=\"ht_toc_list\"><li class=\"\"><a href=\"#htoc-\">Why Does the \u201cCannot Verify Server Identity\u201d Error Occur?<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-expired-ssl-certificate\">Expired SSL Certificate\u00a0<\/a><\/li><li class=\"\"><a href=\"#htoc-domain-name-mismatch\">Domain Name Mismatch&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-self-signed-certificates\">Self-Signed Certificates&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-untrusted-certificate-authority-ca\">Untrusted Certificate Authority (CA)&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-network-interference\">Network Interference&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-incorrect-or-outdated-email-settings\">Incorrect or Outdated Email Settings&nbsp;<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-how-to-fix-the-cannot-verify-server-identity-error1\">How to Fix the \u201cCannot Verify Server Identity\u201d Error\u00a0<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-how-to-fix-the-cannot-verify-server-identity-error11\">1. Restart Your Device and Network Connection\u00a0<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-ios-ipados-macos\">iOS \/ iPadOS \/ macOS&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-windows-android\">Windows \/ Android&nbsp;<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-2-check-the-ssl-certificate-on-the-server\">2. Check the SSL Certificate on the Server&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-3-verify-and-update-email-account-settings\">3. Verify and Update Email Account Settings&nbsp;<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-iphone-ipad-ios-mail-app\">iPhone \/ iPad (iOS Mail App)&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-outlook-windows-macos\">Outlook (Windows \/ macOS)\u00a0<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-4-remove-and-re-add-the-email-account\">4. Remove and Re-add the Email Account&nbsp;<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-on-iphone-ipad\">On iPhone\/iPad:&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-on-windows-macos\">On Windows\/macOS:&nbsp;<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-5-reset-network-settings-ios-amp-android\">5. Reset Network Settings (iOS &amp; Android)&nbsp;<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-ios-ipados\">iOS \/ iPadOS&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-android\">Android&nbsp;<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-6-use-a-trusted-ssl-certificate-server-administrators\">6. Use a Trusted SSL Certificate (Server Administrators)&nbsp;<\/a><ul class=\"ht_toc_child_list\"><li class=\"\"><a href=\"#htoc-cpanel\">cPanel&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-linux-mail-servers\">Linux Mail Servers&nbsp;<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-7-test-with-an-alternate-email-client-or-webmail\">7. Test with an Alternate Email Client&nbsp;or Webmail&nbsp;<\/a><\/li><\/ul><\/li><li class=\"\"><a href=\"#htoc-1\">Best Practices to Prevent Future SSL\/TLS Issues<\/a><\/li><li class=\"\"><a href=\"#htoc-11\">Our\u00a0Scope of Support<\/a><\/li><li class=\"\"><a href=\"#htoc-111\">FAQs<\/a><\/li><li class=\"\"><a href=\"#htoc-111111111\">Additional\u00a0Resources\u00a0<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-\"><strong>Why Does the \u201cCannot Verify Server Identity\u201d Error Occur?<\/strong><\/h2>\n\n\n\n<p>When a device connects to a server using&nbsp;<a href=\"https:\/\/www.youtube.com\/watch?v=JeDKQXgzFwU&amp;t=217\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SSL\/TLS encryption<\/strong><\/a>, it checks that the&nbsp;server\u2019s&nbsp;certificate is valid, trusted, and correctly configured. The error occurs when this verification fails.&nbsp;<\/p>\n\n\n\n<p>Common causes include:&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-expired-ssl-certificate\"><strong>Expired SSL Certificate<\/strong>\u00a0<\/h6>\n\n\n\n<p><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-an-ssl-certificate-and-why-do-i-need-it\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SSL certificates<\/strong><\/a><strong>&nbsp;<\/strong>have&nbsp;a fixed validity period.&nbsp;Once&nbsp;expired, devices will no longer trust the server.&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-domain-name-mismatch\"><strong>Domain Name Mismatch<\/strong>&nbsp;<\/h6>\n\n\n\n<p>The&nbsp;server&nbsp;name you are connecting to must match the&nbsp;<a href=\"https:\/\/www.ssl.com\/faqs\/common-name\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Common Name (CN)<\/strong><\/a>&nbsp;or&nbsp;<a href=\"https:\/\/comodosslstore.com\/resources\/what-is-a-san-certificate\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Subject Alternative Name (SAN)<\/strong><\/a>&nbsp;listed on the certificate.&nbsp;<br>&nbsp;<br>For example, using an<strong>&nbsp;<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/everything-you-need-to-know-about-an-ip-address\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>IP address<\/strong><\/a>&nbsp;instead of&nbsp;<strong>mail.yourdomain.co.za<\/strong>&nbsp;will trigger this error.&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-self-signed-certificates\"><strong>Self-Signed Certificates<\/strong>&nbsp;<\/h6>\n\n\n\n<p>Many devices and email clients reject&nbsp;<a href=\"https:\/\/www.sectigo.com\/blog\/what-is-a-self-signed-certificate\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>self-signed certificates<\/strong><\/a><strong>&nbsp;<\/strong>unless they are manually trusted.&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-untrusted-certificate-authority-ca\"><strong>Untrusted Certificate Authority (CA)<\/strong>&nbsp;<\/h6>\n\n\n\n<p>If the certificate&nbsp;was&nbsp;issued by a&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Certificate_authority\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>CA<\/strong><\/a><strong>&nbsp;<\/strong><a href=\"https:\/\/www.youtube.com\/watch?v=qpX_zjRJlEw\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>not&nbsp;recognised<\/strong><\/a>&nbsp;by your device, verification will fail.&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-network-interference\"><strong>Network Interference<\/strong>&nbsp;<\/h6>\n\n\n\n<p><a href=\"https:\/\/us.norton.com\/blog\/privacy\/public-wifi\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Public Wi-Fi networks<\/strong><\/a>,&nbsp;<a href=\"https:\/\/avsystem.com\/blog\/captive-portal-hotspot-management-wifi-advertising-faq\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>captive portals<\/strong><\/a>,&nbsp;<a href=\"https:\/\/1grid.co.za\/knowledge\/?s=VPN&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>VPNs<\/strong><\/a><strong>,<\/strong>&nbsp;or&nbsp;<a href=\"https:\/\/www.google.com\/search?q=firewall&amp;rlz=1C1GCEA_enZA1070ZA1071&amp;oq=firewall&amp;gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIHCAEQABiPAjIGCAIQRRg80gEJMjA0MmowajE1qAIIsAIB8QWxvS2JekVi7Q&amp;sourceid=chrome&amp;ie=UTF-8\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>firewalls<\/strong><\/a><strong>&nbsp;<\/strong>can interrupt certificate validation.&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-incorrect-or-outdated-email-settings\"><strong>Incorrect or Outdated Email Settings<\/strong>&nbsp;<\/h6>\n\n\n\n<p>Incorrect server names, ports, encryption types, or outdated configurations&nbsp;in<strong>&nbsp;<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>email settings<\/strong><\/a><strong>&nbsp;<\/strong>commonly cause this issue.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-how-to-fix-the-cannot-verify-server-identity-error1\"><strong>How to Fix the \u201cCannot Verify Server Identity\u201d Error\u00a0<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"htoc-how-to-fix-the-cannot-verify-server-identity-error11\"><strong>1. Restart Your Device and Network Connection<\/strong>\u00a0<\/h3>\n\n\n\n<p>Before making changes, it is important to rule out potential temporary issues.&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-ios-ipados-macos\"><strong>iOS \/ iPadOS \/ macOS<\/strong>&nbsp;<\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-close-the-mail-app-completely\">Close the Mail app completely\u00a0<\/li>\n\n\n\n<li id=\"htoc-restart-your-device\">Restart your device\u00a0<\/li>\n\n\n\n<li id=\"htoc-reconnect-to-a-stable-network\">Reconnect to a stable network\u00a0<\/li>\n<\/ul>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-windows-android\"><strong>Windows \/ Android<\/strong>&nbsp;<\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-close-the-email-client-outlook-thunderbird-etc\">Close the email client (Outlook, Thunderbird, etc.)\u00a0<\/li>\n\n\n\n<li id=\"htoc-restart-the-device\">Restart the device\u00a0<\/li>\n\n\n\n<li id=\"htoc-switch-between-wi-fi-and-mobile-data-if-possible\">Switch between Wi-Fi and mobile data if possible\u00a0<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"htoc-2-check-the-ssl-certificate-on-the-server\"><strong>2. Check the SSL Certificate on the Server<\/strong>&nbsp;<\/h3>\n\n\n\n<p>If you manage the server or domain:&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li id=\"htoc-open-a-browser-and-visit-https-yourmailserver-com\">Open a browser and visit\u00a0<a href=\"https:\/\/yourmailserver.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/yourmailserver.com<\/a>\u00a0<\/li>\n\n\n\n<li id=\"htoc-click-the-padlock-icon-in-the-address-bar\">Click the padlock icon in the address bar\u00a0<\/li>\n\n\n\n<li id=\"htoc-review-whether-the-certificate-is-valid-expired-or-mismatched\">Review whether the certificate is valid, expired, or mismatched\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\"><\/ol>\n\n\n\n<p>If the certificate&nbsp;is expired&nbsp;or untrusted, it must be&nbsp;<a href=\"https:\/\/1grid.co.za\/website-security\/ssl\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>renewed or replaced<\/strong><\/a>.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"htoc-3-verify-and-update-email-account-settings\"><strong>3. Verify and Update Email Account Settings<\/strong>&nbsp;<\/h3>\n\n\n\n<p>Verify that you have the correct&nbsp;<a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>email settings<\/strong><\/a><strong>&nbsp;<\/strong>for your device and email client.&nbsp;<\/p>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-iphone-ipad-ios-mail-app\"><strong><em><\/em><\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/#htoc-2-setting-up-email-on-apple-mail-mac-iphone-ipad\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>iPhone \/ iPad (iOS Mail App)<\/em><\/strong><\/a><strong><em><\/em><\/strong>&nbsp;<\/h6>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li id=\"htoc-go-to-settings-mail-accounts\">Go to\u00a0<strong>Settings \u2192 Mail \u2192 Accounts<\/strong>\u00a0<\/li>\n\n\n\n<li id=\"htoc-select-the-email-account1\">Select the email account\u00a0<\/li>\n\n\n\n<li id=\"htoc-confirm-incoming-and-outgoing-server-settings\">Confirm <strong>Incoming and Outgoing server settings<\/strong>\u00a0<\/li>\n\n\n\n<li id=\"htoc-ensure-the-hostname-matches-the-ssl-certificate\">Ensure the hostname matches the SSL certificate\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\"><\/ol>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-outlook-windows-macos\"><a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/#htoc-1-setting-up-email-on-outlook-windows-amp-mac\"><strong><em>Outlook (Windows \/ macOS)<\/em><\/strong>\u00a0<\/a><\/h6>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li id=\"htoc-go-to-file-account-settings\">Go to\u00a0<strong>File \u2192 Account Settings<\/strong>\u00a0<\/li>\n\n\n\n<li id=\"htoc-select-the-account-and-click-change1\">Select the account and click\u00a0<strong>Change<\/strong>\u00a0<\/li>\n\n\n\n<li id=\"htoc-verify-server-names-and-encryption-settings\">Verify server names and encryption settings\u00a0<\/li>\n\n\n\n<li id=\"htoc-update-ports-under-advanced-settings\">Update ports under\u00a0<strong>Advanced Settings<\/strong>\u00a0<\/li>\n<\/ol>\n\n\n\n<p><strong>Correct\u00a0<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>ports with SSL<\/strong><\/a><strong>\u00a0to be enabled:<\/strong>\u00a0<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-imap-993\">IMAP:\u00a0<strong>993<\/strong>\u00a0<\/li>\n\n\n\n<li id=\"htoc-pop3-995\">POP3:\u00a0<strong>995<\/strong>\u00a0<\/li>\n\n\n\n<li id=\"htoc-smtp-465-or-587\">SMTP:\u00a0<strong>465 or 587<\/strong>\u00a0<\/li>\n<\/ul>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\"><\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"htoc-4-remove-and-re-add-the-email-account\"><strong>4. Remove and Re-add the Email Account<\/strong>&nbsp;<\/h3>\n\n\n\n<p>If the issue persists, reconfiguring the account&nbsp;by<strong>&nbsp;<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=email+account&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>removing and re-adding<\/strong><\/a>&nbsp;the email account&nbsp;often resolves cached or outdated settings.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-remove-the-email-account\">Remove the email account\u00a0<\/li>\n\n\n\n<li id=\"htoc-restart-your-device1\">Restart your device\u00a0<\/li>\n\n\n\n<li id=\"htoc-re-add-the-account-using-the-correct-server-details\">Re-add the account using the correct server details\u00a0<\/li>\n<\/ul>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-on-iphone-ipad\"><strong>On iPhone\/iPad:<\/strong>&nbsp;<\/h6>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li id=\"htoc-go-to-settings-mail-accounts1\">Go to\u00a0<strong>Settings > Mail > Accounts<\/strong>.\u00a0<\/li>\n\n\n\n<li id=\"htoc-select-the-problematic-account-and-tap-delete-account\">Select the problematic account and tap\u00a0<strong>Delete Account<\/strong>.\u00a0<\/li>\n\n\n\n<li id=\"htoc-restart-your-device-and-re-add-the-account-with-the-correct-settings1\">Restart your device and re-add the account with the correct settings.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\"><\/ol>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-on-windows-macos\"><strong>On Windows\/macOS:<\/strong>&nbsp;<\/h6>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li id=\"htoc-open-your-email-client-and-navigate-to-account-settings\">Open your email client and navigate to\u00a0<strong>Account Settings<\/strong>.\u00a0<\/li>\n\n\n\n<li id=\"htoc-remove-the-affected-account-and-restart-your-device\">Remove the affected account and restart your device.\u00a0<\/li>\n\n\n\n<li id=\"htoc-add-the-account-again-with-the-correct-server-details\">Add the account again with the correct server details.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\"><\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"htoc-5-reset-network-settings-ios-amp-android\"><strong>5. Reset Network Settings (iOS &amp; Android)<\/strong>&nbsp;<\/h3>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-ios-ipados\"><strong>iOS \/ iPadOS<\/strong>&nbsp;<\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-settings-general-reset-reset-network-settings\"><strong>Settings \u2192 General \u2192 Reset \u2192 Reset Network Settings<\/strong>\u00a0<\/li>\n<\/ul>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-android\"><strong>Android<\/strong>&nbsp;<\/h6>\n\n\n\n<p>Many modern Android phones (Android 10+) for resetting network settings, though it can vary slightly by manufacturer.&nbsp;<\/p>\n\n\n\n<p>For Samsung devices, you can&nbsp;<a href=\"https:\/\/youtu.be\/ah99wYYtUqU?si=Dqlfkcm8Mozb5p_A\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>follow these steps<\/strong><\/a><strong>:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-settings-general-management-reset-reset-network-settings-reset-settings-reset\"><strong>Settings \u2192 General management \u2192 Reset \u2192 Reset\u00a0network settings \u2192 Reset settings \u2192 Reset\u00a0<\/strong><\/li>\n<\/ul>\n\n\n\n<p>For many other Android devices, you can follow these steps (may slightly vary):&nbsp;&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-settings-system-reset-options-reset-wi-fi-mobile-amp-bluetooth\"><strong>Settings \u2192 System \u2192 Reset options \u2192 Reset Wi-Fi, mobile &amp; Bluetooth\u00a0<\/strong><\/li>\n<\/ul>\n\n\n\n<p><strong>IMPORTANT:<\/strong>&nbsp;This removes saved Wi-Fi passwords.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"htoc-6-use-a-trusted-ssl-certificate-server-administrators\"><strong>6. Use a Trusted SSL Certificate (Server Administrators)<\/strong>&nbsp;<\/h3>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-cpanel\"><strong>cPanel<\/strong>&nbsp;<\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-ssl-tls-manage-ssl-sites\"><strong>SSL\/TLS \u2192 Manage SSL Sites<\/strong>\u00a0<\/li>\n\n\n\n<li id=\"htoc-verify-or-reinstall-the-certificate\">Verify or reinstall the certificate\u00a0<\/li>\n\n\n\n<li id=\"htoc-use-let-s-encrypt-or-another-trusted-ca\">Use\u00a0<a href=\"https:\/\/1grid.co.za\/knowledge\/?s=Let%27s+encrypt&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Let\u2019s\u00a0Encrypt<\/strong><\/a><strong>\u00a0<\/strong>or <strong>another trusted CA<\/strong>\u00a0<\/li>\n<\/ul>\n\n\n\n<h6 class=\"wp-block-heading\" id=\"htoc-linux-mail-servers\"><strong>Linux Mail Servers<\/strong>&nbsp;<\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-confirm-correct-certificate-paths-in-etc-postfix-main-cf\">Confirm the correct certificate paths\u00a0in\u00a0<code style=\"color: rgb(35, 35, 37); font-size: 16px; background-color: rgb(255, 255, 255);\">\/etc\/postfix\/main.cf<\/code><span style=\"color: rgb(35, 35, 37); font-family: Inter; font-size: 16px;\">:<\/span>\u00a0<\/li>\n<\/ul>\n\n\n\n<p><pre><code>smtpd_tls_cert_file=\/etc\/ssl\/certs\/server.pem<br>smtpd_tls_key_file=\/etc\/ssl\/private\/server.key<\/code><\/pre><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-restart-mail-services-after-changes\">Restart mail services after changes:\u00a0<\/li>\n<\/ul>\n\n\n\n<p><pre><code>sudo systemctl restart postfix<\/code><\/pre><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"htoc-7-test-with-an-alternate-email-client-or-webmail\"><strong>7. Test with an Alternate Email Client&nbsp;or Webmail<\/strong>&nbsp;<\/h3>\n\n\n\n<p id=\"htoc-how-to-fix-the-cannot-verify-server-identity-error1\">If the error only appears in one app, test using<strong>&nbsp;<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=webmail&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>webmail<\/strong><\/a>&nbsp;or another email client to isolate the issue.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-1\"><strong>Best Practices to Prevent Future SSL\/TLS Issues<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-monitor-ssl-certificate-expiry-dates\">Monitor SSL certificate expiry dates\u00a0<\/li>\n\n\n\n<li id=\"htoc-always-use-domain-based-server-names\">Always use domain-based server names\u00a0<\/li>\n\n\n\n<li id=\"htoc-keep-devices-and-email-apps-updated\">Keep devices and email apps updated\u00a0<\/li>\n\n\n\n<li id=\"htoc-avoid-configuring-email-on-unsecured-public-networks\">Avoid configuring email on unsecured public networks\u00a0<\/li>\n\n\n\n<li id=\"htoc-document-dns-and-server-changes\">Document\u00a0<a href=\"https:\/\/1grid.co.za\/knowledge\/?s=DNS&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>DNS<\/strong><\/a><strong>\u00a0<\/strong>and server changes\u00a0<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-11\"><strong>Our\u00a0<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Scope of Support<\/strong><\/a><\/h2>\n\n\n\n<p>If\u00a0you\u2019re\u00a0stuck and need any\u00a0additional\u00a0guidance or support,\u00a0here\u2019s\u00a0an outline of what we can do and what is not within\u00a0our<strong>\u00a0<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Scope of Support<\/strong><\/a>.\u00a0<\/p>\n\n\n\n<p><strong><\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\/#htoc-standard-support-included\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Included Support<\/strong><\/a><strong><\/strong>&nbsp;<\/p>\n\n\n\n<p>We can&nbsp;assist&nbsp;with:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-checking-ssl-certificate-validity\">Checking SSL certificate validity\u00a0<\/li>\n\n\n\n<li id=\"htoc-verifying-dns-and-mail-server-records\">Verifying DNS and mail server records\u00a0<\/li>\n\n\n\n<li id=\"htoc-confirming-correct-server-configuration\">Confirming correct server configuration\u00a0<\/li>\n\n\n\n<li id=\"htoc-guiding-safe-troubleshooting-steps\">Guiding safe troubleshooting steps\u00a0<\/li>\n<\/ul>\n\n\n\n<p><strong><\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\/#htoc-11111\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Advanced Support (Paid Services)<\/strong><\/a><strong><\/strong>&nbsp;<\/p>\n\n\n\n<p>We may&nbsp;assist&nbsp;with some services that&nbsp;require&nbsp;advanced support.&nbsp;<\/p>\n\n\n\n<p><strong><\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\/#htoc-11111111\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Outside Our Scope<\/strong><\/a><strong><\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-device-operating-system-bugs\">Device operating system bugs\u00a0<\/li>\n\n\n\n<li id=\"htoc-forcing-trust-on-invalid-certificates\">Forcing trust on invalid certificates\u00a0<\/li>\n\n\n\n<li id=\"htoc-vpn-or-third-party-firewall-configuration\">VPN or third-party\u00a0firewall\u00a0configuration\u00a0<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-111\"><strong>FAQs<\/strong><\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q. Is this error dangerous?<\/strong><\/summary>\n<p id=\"htoc-1111\">Not inherently, but it should never be ignored. It exists to protect your data.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q.\u00a0Is this error a sign that my email has been hacked?<\/strong><\/summary>\n<p id=\"htoc-11111\">No, it is a security warning designed to protect you.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q.\u00a0Should I click \u201cContinue\u201d or \u201cTrust\u201d?<\/strong><\/summary>\n<p id=\"htoc-111111\">Only if you are absolutely\u00a0certain\u00a0the server is legitimate.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q.\u00a0Why does this happen on my phone but\u00a0not\u00a0my computer?<\/strong><\/summary>\n<p id=\"htoc-1111111\">Devices handle certificate caching and security checks differently.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q.\u00a0Will re-adding my email fix the issue?<\/strong><\/summary>\n<p id=\"htoc-11111111\">Yes, especially after DNS, hosting, or SSL changes.<\/p>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-111111111\"><strong>Additional\u00a0Resources\u00a0<\/strong><\/h2>\n\n\n\n<p><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-an-ssl-certificate-and-why-do-i-need-it\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>What Is SSL and Why It Matters<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-steps-for-email\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Basic Troubleshooting Steps for Email<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/troubleshooting-a-security-certificate-warning-pop-up-in-outlook\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Troubleshooting a Security Certificate Warning Pop-Up in Outlook<\/strong><\/a><strong>\u00a0<\/strong><br><a href=\"https:\/\/1grid.co.za\/knowledge\/email-error-messages-what-do-they-mean\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Email Error Messages and How to Fix Them<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=secure+website&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Secure Your Website<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=DNS&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Understanding DNS Records and How to Check These<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-dns-propagation-and-why-does-it-take-so-long\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How DNS Propagation Works<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-1111111111\"><strong>Need Additional Support?\u00a0<\/strong><\/h2>\n\n\n\n<p><strong>We&#8217;re&nbsp;Here to&nbsp;<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Help<\/strong><\/a><strong>:<\/strong>&nbsp;<\/p>\n\n\n\n<p>Fixing&nbsp;a \u201cCannot Verify Server Identity\u201d error&nbsp;doesn\u2019t&nbsp;have to feel&nbsp;technical&nbsp;with&nbsp;this&nbsp;easy-to-reference guide. Stuck?&nbsp;Check out our&nbsp;<a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Scope of&nbsp;Support<\/strong><\/a>, and&nbsp;then contact our Support Team for&nbsp;further&nbsp;clarity and&nbsp;guidance&nbsp;(<a href=\"https:\/\/1grid.co.za\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>https:\/\/1grid.co.za\/contact-us\/<\/strong><\/a>).&nbsp;We&#8217;re&nbsp;ready&nbsp;to see how we can help!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The&nbsp;\u201cCannot Verify Server Identity\u201d&nbsp;error typically appears when an email app or device cannot confirm the security certificate of the server it is trying to connect to.&nbsp;While the message may feel alarming, it is actually a&nbsp;protective security feature&nbsp;designed to prevent your data from being intercepted or compromised.&nbsp; This error is\u00a0most commonly&#8230;<\/p>\n","protected":false},"author":21,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"ht-kb-category":[1173,1194],"ht-kb-tag":[170,336,344,369,413,480,499,545,591,898,905,908,1091],"class_list":["post-24100","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email","ht_kb_category-email-troubleshooting","ht_kb_tag-cannot","ht_kb_tag-email","ht_kb_tag-email-hosting","ht_kb_tag-error","ht_kb_tag-fix","ht_kb_tag-how-to","ht_kb_tag-identity","ht_kb_tag-iphone","ht_kb_tag-mac","ht_kb_tag-server","ht_kb_tag-setting","ht_kb_tag-setup","ht_kb_tag-verify"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Fix the \u201cCannot Verify Server Identity\u201d Error -<\/title>\n<meta name=\"description\" content=\"Learn what causes the \u201cCannot Verify Server 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