{"id":23208,"date":"2023-11-28T11:04:56","date_gmt":"2023-11-28T05:34:56","guid":{"rendered":"https:\/\/www.stellarinfo.co.in\/blog\/?p=23208"},"modified":"2026-02-13T15:52:56","modified_gmt":"2026-02-13T10:22:56","slug":"how-to-fix-outlook-certificate-error","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.co.in\/blog\/how-to-fix-outlook-certificate-error\/","title":{"rendered":"How to Fix Outlook Certificate Error?"},"content":{"rendered":"<table style=\"border: 2px dashed #eee; height: 116px;\">\n<tbody>\n<tr>\n<th style=\"background-color: #eee; text-align: justify;\"><strong>Summary: <\/strong><span style=\"font-weight: 400;\"><strong>Learn the reasons behind the Outlook Certificate Error that prevents Outlook users from securely sending or receiving their emails. Also, learn the troubleshooting methods and solutions to fix the Outlook certificate error with the help of manual solutions and restore all your emails securely with the help of an advanced <a href=\"https:\/\/www.stellarinfo.co.in\/software\/outlook-pst-recovery.php\" target=\"_blank\" rel=\"noopener\">PST recovery tool<\/a> in case the error can\u2019t be resolved.<\/strong> <\/span><\/p>\n<p><a href=\"https:\/\/cloud.stellarinfo.co.in\/blog\/pst-repair\/StellarRepairforOutlook.exe\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-22794 size-full\" src=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/free-download-Win.png\" alt=\"Stellar Windows Free Download\" width=\"260\" height=\"80\" srcset=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/free-download-Win.png 260w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/free-download-Win-150x46.png 150w\" sizes=\"auto, (max-width: 260px) 100vw, 260px\" \/><\/a><\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-weight: 400;\">Outlook certificate error appears when you try to connect or sign into your email account hosted on an unsecured server or the connection between the mailbox server and the client (Outlook) is not encrypted or secure (SSL\/HTTPS). <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The error prevents Outlook users from sending or receiving their emails securely. Any hacker or malicious actor can intercept your confidential and sensitive email communication that may threaten your business or your personal and professional life. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Follow this guide to learn the reasons that can trigger such errors in Outlook and solutions to troubleshoot and fix this error and ensure Outlook works securely and the Outlook certificate error does not appear.<\/span><\/p>\n<p><strong>Table of Content:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/www.stellarinfo.co.in\/blog\/how-to-fix-outlook-certificate-error\/#srv1\"><strong>Reasons for Outlook Certificate Error<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.stellarinfo.co.in\/blog\/how-to-fix-outlook-certificate-error\/#srv2\"><strong>Solutions to Troubleshoot and Resolve Outlook Certificate Error<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.stellarinfo.co.in\/blog\/how-to-fix-outlook-certificate-error\/#srv3\"><strong>Conclusion- Outlook Certificate Error<\/strong><\/a><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><a href=\"https:\/\/www.stellarinfo.co.in\/software\/buy\/outlook-pst\/buy-now.php?utm_source=Blog&amp;utm_medium=PST-Repair&amp;utm_campaign=Blog-Mid-Banner\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-22710 size-full\" src=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/Midbanner-stellar-repair-for-outlook.jpg\" alt=\"Mid-banner-stellar-repair-for-outlook\" width=\"850\" height=\"350\" srcset=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/Midbanner-stellar-repair-for-outlook.jpg 850w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/Midbanner-stellar-repair-for-outlook-300x124.jpg 300w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/Midbanner-stellar-repair-for-outlook-150x62.jpg 150w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/Midbanner-stellar-repair-for-outlook-768x316.jpg 768w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/09\/Midbanner-stellar-repair-for-outlook-610x250.jpg 610w\" sizes=\"auto, (max-width: 850px) 100vw, 850px\" \/><\/a><\/p>\n<h2><strong id=\"srv1\">Reasons for Outlook Certificate Error<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">The Outlook Certificate Error occurs when the security certificate installed or used on the email or mailbox server is expired or not trusted by the email client.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As a result, Outlook users see a warning message that indicates that the server&#8217;s security certificate is invalid.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-23257 size-full\" src=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Outlook-users-see-a-warning-message-that-indicates-that-the-servers-security-certificate-is-invalid.jpg\" alt=\"Outlook users see a warning message that indicates that the server's security certificate is invalid.\" width=\"300\" height=\"172\" srcset=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Outlook-users-see-a-warning-message-that-indicates-that-the-servers-security-certificate-is-invalid.jpg 300w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Outlook-users-see-a-warning-message-that-indicates-that-the-servers-security-certificate-is-invalid-150x86.jpg 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">The error message may vary based on the Outlook and Windows version you are using. However, the reasons and challenges remain the same. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">Below are some prominent reasons that can lead to this error in Outlook 2007, 2010, 2013, 2016, 2019, or 2021.\u00a0<\/span><\/p>\n<p><strong>Also Read: <a href=\"https:\/\/www.stellarinfo.co.in\/kb\/what-are-outlook-pst-files.php\" target=\"_blank\" rel=\"noopener\">What are Outlook PST files? Recovery of Outlook PST files<\/a><\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Mismatch between the domain name on the server&#8217;s security certificate and the domain name used to access the email server.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Using a self-signed certificate\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Expired or incorrectly configured SSL certificates<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Incorrect hostname while signing in to Outlook<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><a href=\"https:\/\/www.stellarinfo.co.in\/kb\/repair-damaged-pst-file.php\" target=\"_blank\" rel=\"noopener\"><strong>Damaged or corrupt Outlook data file<\/strong><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Corrupt Outlook profile<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Outdated Outlook<\/span><\/li>\n<\/ul>\n<h2><strong id=\"srv2\">Solutions to Troubleshoot and Resolve Outlook Certificate Error<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">To troubleshoot and resolve the Outlook certificate error, you can follow the below solutions in the given sequence. The solutions start from basic troubleshooting to advanced methods to fix the error.<\/span><\/p>\n<h3><b>Solution 1. Verify Server Certificate Name<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">To avoid the Outlook certificate error, make sure the name on the certificate matches on both the email client and the mailbox server. <\/span><\/p>\n<p><em><strong>For this, follow these steps:<\/strong><\/em><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Open the Outlook client and click on the <em><strong>\u201c<\/strong><\/em><\/span><em><strong>View Certificate<\/strong><\/em><span style=\"font-weight: 400;\"><em><strong>\u201d<\/strong><\/em> button when the error appears.<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-23260 size-full\" src=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/View-Certificate.jpg\" alt=\"Outlook Certificate Error\" width=\"446\" height=\"141\" srcset=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/View-Certificate.jpg 446w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/View-Certificate-300x95.jpg 300w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/View-Certificate-150x47.jpg 150w\" sizes=\"auto, (max-width: 446px) 100vw, 446px\" \/><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Then click on <em><strong>\u201c<\/strong><\/em><\/span><em><strong>Issued to Name<\/strong><\/em><span style=\"font-weight: 400;\"><em><strong>\u201d<\/strong><\/em> and check whether the name mentioned on the certificate is the same as stated on the mail server.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If the names are different, edit and update it.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Then restart Outlook.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">This should fix the error if caused by a mismatch in the names on the mailbox server and the client (Outlook app). <\/span><\/p>\n<h3><b>Solution 2: Update Email Client<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Some temporary bugs can trigger the error in Outlook if not updated to the latest build. The steps to update Outlook are as follows: <\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">Launch Outlook, navigate to <em><strong>&#8220;<\/strong><\/em><\/span><em><strong>File &gt; Office Account<\/strong><\/em><span style=\"font-weight: 400;\"><em><strong>&#8220;<\/strong><\/em> and click <em><strong>&#8220;<\/strong><\/em><\/span><em><strong>Update Options.&#8221;<\/strong><\/em><\/li>\n<li><span style=\"font-weight: 400;\">From the drop-down, choose <em><strong>&#8220;<\/strong><\/em><\/span><em><strong>Update Now.<\/strong><\/em><span style=\"font-weight: 400;\"><em><strong>&#8220;<\/strong><\/em> This will check for updates.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-23259 size-full\" src=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Update-Now.jpg\" alt=\"Outlook Certificate Error\" width=\"940\" height=\"703\" srcset=\"https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Update-Now.jpg 940w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Update-Now-300x224.jpg 300w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Update-Now-150x112.jpg 150w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Update-Now-768x574.jpg 768w, https:\/\/www.stellarinfo.co.in\/blog\/wp-content\/uploads\/2023\/11\/Update-Now-320x240.jpg 320w\" sizes=\"auto, (max-width: 940px) 100vw, 940px\" \/><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">If new updates are available for your Outlook version or build, download and install them.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After the update, restart Outlook. This will allow the changes to take effect.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">\u00a0 If the Update Options are not available in your Outlook, you can also download and install Windows updates to fix such bugs in Outlook. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">This will help you fix any bug or issue that may have triggered the certificate error in Outlook.<\/span><\/p>\n<p><strong>Also Read: <a href=\"https:\/\/www.stellarinfo.co.in\/blog\/error-451-email-in-outlook\/\" target=\"_blank\" rel=\"noopener\">What is Error 451 Email in Outlook?<\/a><\/strong><\/p>\n<h3><b>Solution 3: Clear SSL Cache<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Sometimes the certificate is updated on the mailbox server but Outlook keeps using the cached SSL certificate to validate the connection. However, this leads to a mismatch of the certificate and causes an Outlook certificate error to appear. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">In such a case, <\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You can clear the SSL state on the Outlook client to remove and delete any cached or stored certificates.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">To delete the cached certificate, you can either remove your email account and then sign in again or create a new profile and sign in using the same email ID.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">By clearing the SSL cache, you enable Outlook to re-establish a clean and secure connection with the new certificate on the email server.<\/span><\/p>\n<h3><b>Solution 4: Install a Trusted Certificate<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Many times, servers may use a self-signed certificate, which is not secure. In case your mailbox server is configured to use a self-signed certificate, buy or obtain a certificate from a trusted certificate authority (CA) and install it on the server. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you don\u2019t have authority or access to the server or install the certificate, you can contact your administrator.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Updating the certificate with a trusted one will help you eliminate the certificate error.<\/span><\/p>\n<h3><b>Solution 5: Repair Outlook PST File- Outlook Certificate Error<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">You can use the SCANPST or Inbox Repair tool to <a href=\"https:\/\/www.stellarinfo.co.in\/blog\/guide-to-repair-pst-files-in-outlook\/\" target=\"_blank\" rel=\"noopener\"><strong>repair the PST file<\/strong><\/a> that stores all Outlook mail items and other data, including the certificate. The tool is available in all Outlook versions, such as Outlook 2007, 2010, 2013, 2016, 2019, and 2021.<\/span><\/p>\n<p><em><strong>The steps are as follows:<\/strong><\/em><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Close Outlook and open <\/span><b>File Explorer<\/b><span style=\"font-weight: 400;\"> to find the PST file. The file is located in the %localappdata%\/Microsoft\/Outlook folder.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once found, create a backup of the PST file by copying it to another folder or drive.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Then go to<\/span><b> C:\\Program, Files\\Microsoft Office\\root\\Officexx<\/b><span style=\"font-weight: 400;\"> location.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Find and launch SCANPST.exe tool.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In the Inbox Repair tool, click <\/span><b>Browse <\/b><span style=\"font-weight: 400;\">to select the PST file.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click <\/span><b>Start<\/b><span style=\"font-weight: 400;\"> to begin the scan.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After the scan, the tool will display if there are any errors or inconsistencies in the PST file. If it finds it, click <\/span><b>Repair.<\/b><span style=\"font-weight: 400;\">\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">After the repair, start Outlook<\/span><\/li>\n<\/ul>\n<p><strong>Also Read: <a href=\"https:\/\/www.stellarinfo.co.in\/blog\/fix-outlook-not-responding-error\/\" target=\"_blank\" rel=\"noopener\">How to Fix Outlook Not Responding Error?<\/a><\/strong><\/p>\n<p><b>NOTE: <\/b><span style=\"font-weight: 400;\">SCANPST can repair minor inconsistencies in the PST file with sizes up to 2GB. It may fail to repair an oversized, encrypted, or severely corrupt PST file. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">If SCANPST fails to repair the PST file, crashes, or freezes during the repair process, you can use an advanced Outlook PST repair tool such as Stellar Repair for Outlook.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Unlike SCANPST, this advanced software can repair large or oversized PST files (up to 50GB or more) with complete integrity and precision. It can also repair encrypted severely corrupt or damaged PST files in a few clicks. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">After the repair, you can import the repaired PST file into a new Outlook profile to store all mail items and continue to use Outlook without encountering the Outlook certificate error.<\/span><\/p>\n<p><strong>Also Read: <a href=\"https:\/\/www.stellarinfo.co.in\/blog\/activation-key-for-stellar-outlook-repair\/\" target=\"_blank\" rel=\"noopener\">How to get Activation Key for Stellar Outlook Repair?<\/a><\/strong><\/p>\n<h3><strong id=\"srv3\">Conclusion- Outlook Certificate Error<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">The Outlook Certificate Error can disrupt the workflow and productivity. It can also potentially lead to email theft if you continue to send or receive emails on an unsecured connection due to a certificate error. Follow the methods discussed in this guide to troubleshoot and fix the Outlook certificate error. Use SCANPST to repair the PST file that may help you fix the error if caused by a damaged, inconsistent, or corrupt PST file. If the SCANPST fails, you can always rely on advanced Outlook repair software, such as Stellar Repair for Outlook to repair and <a href=\"https:\/\/www.stellarinfo.co.in\/blog\/how-to-recover-deleted-emails-in-outlook\/\" target=\"_blank\" rel=\"noopener\"><strong>recover emails<\/strong><\/a> from severely damaged or corrupt and encrypted PST files to a new PST file without any size limit.<\/span><\/p>\n<p><strong>Also Read: <a href=\"https:\/\/www.stellarinfo.co.in\/blog\/repair-pst-when-scanpst-is-not-responding\/\" target=\"_blank\" rel=\"noopener\">How to Repair PST when ScanPST is not responding?<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Summary: Learn the reasons behind the Outlook Certificate Error that prevents Outlook users from securely sending or receiving their emails. Also, learn the troubleshooting methods and solutions to fix the Outlook certificate error with the help of manual solutions and restore all your emails securely with the help of an advanced PST recovery tool in [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":23256,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-23208","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stellar-repair-for-outlook","has_thumb"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Outlook Certificate Error- Fixed<\/title>\n<meta name=\"description\" content=\"Outlook Certificate Error- Learn reasons and solutions to troubleshoot them to restore secure Outlook communication.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.stellarinfo.co.in\/blog\/how-to-fix-outlook-certificate-error\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Outlook Certificate Error- Fixed\" \/>\n<meta property=\"og:description\" content=\"Outlook Certificate Error- Learn reasons and solutions to troubleshoot them to restore secure Outlook communication.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.stellarinfo.co.in\/blog\/how-to-fix-outlook-certificate-error\/\" \/>\n<meta property=\"og:site_name\" content=\"Stellar Data Recovery Blog - 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