{"id":1890,"date":"2021-09-09T11:05:34","date_gmt":"2021-09-09T11:05:34","guid":{"rendered":"https:\/\/www.emailsupport.us\/blog\/?p=1890"},"modified":"2021-09-15T10:32:50","modified_gmt":"2021-09-15T10:32:50","slug":"outlook-certificate-error","status":"publish","type":"post","link":"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/","title":{"rendered":"Fix Outlook Certificate Error &#8211; Causes and Solutions"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Outlook certificate error majorly occurs when you are connecting to an insecure email server or have network issues. It can also occur due to the wrong hostname, for instance, your name in place of your company hosting server name.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">You must have come across a message that says \u2018The server you are connected to is using a security certificate that cannot be verified. This warning is called an outlook certificate error.\u00a0<\/span><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/outlook-certificate-error.png\" alt=\"Outlook certificate error\" width=\"800\" height=\"450\" class=\"alignnone size-full wp-image-1919\" srcset=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/outlook-certificate-error.png 800w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/outlook-certificate-error-300x169.png 300w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/outlook-certificate-error-768x432.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The purpose of the outlook certificate is to confirm to the recipient that the mail is legit and not tempted or altered by anyone.<\/span><\/p>\n<p>&nbsp;<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#Why_Do_You_Encounter_an_Outlook_Certificate_Error\" >Why Do You Encounter an Outlook Certificate Error?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#What_are_the_Solutions_to_Fix_Outlook_Certificate_Error\" >What are the Solutions to Fix Outlook Certificate Error?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#Solution_1_Certificate_Name_Verification\" >Solution 1: Certificate Name Verification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#Solution_2_Use_Domain_Name_of_Your_Hosting_as_Mail_Server\" >Solution 2: Use Domain Name of Your Hosting as Mail Server<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#Solution_3_Add_Non-SSL_port\" >Solution 3: Add Non-SSL port<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#Solution_4_Change_the_Outgoing_SMTP_Port\" >Solution 4:\u00a0 Change the Outgoing SMTP Port<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#Outlook_Certificate_Error_Due_to_Corrupted_PST_Files\" >Outlook Certificate Error Due to Corrupted PST Files<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-certificate-error\/#When_Should_You_Install_or_Not_Install_a_Certificate\" >When Should You Install or Not Install a Certificate?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Why_Do_You_Encounter_an_Outlook_Certificate_Error\"><\/span><b>Why Do You Encounter an Outlook Certificate Error?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">For an outlook certificate error to occur there can be multiple reasons. Hence, you can deal with those reasons if you are aware of them.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>1. Invalid Security Certificate:<\/b><span style=\"font-weight: 400;\"> The prime reason is to have an invalid security certificate between the mail server and the client. If you want to connect to your client, make sure that the email server holds a valid security certificate.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>2. Incorrect Date &amp; Time:<\/b><span style=\"font-weight: 400;\"> Incorrect date and time can cause an outlook certificate error. You may not be aware but each certificate has an expiry time. Hence, make sure your PC has the correct date and time to escape the error.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>3. Change Domain Name:<\/b><span style=\"font-weight: 400;\"> if an <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/en.wikipedia.org\/wiki\/Internet_service_provider\">Internet Service provider<\/a> (ISP) changed a server,\u00a0 it may also have changed the domain name. In this case, it will redirect you to a new address that is not listed in their SSL list. Therefore changing the domain name causes an error.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>4. Wrong Hostname:<\/b><span style=\"font-weight: 400;\"> Always check the hostname you entered while making a new account for MS Outlook. If you mistakenly enter the wrong hostname, you will get the error.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">5. <\/span><b>Ports Restricted:<\/b><span style=\"font-weight: 400;\"> Usually, institutions like schools and colleges put restrictions on some SSL ports. Hence, if you try to connect to a client via such ports, an error will occur.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">6. <\/span><b>Incorrect Port Number:<\/b><span style=\"font-weight: 400;\"> While creating a new port configuration on MS Outlook, an error will occur in Sever mail if you enter an incorrect port number.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Read Also: <strong><a target=\"_blank\" href=\"https:\/\/www.emailsupport.us\/blog\/outlook-data-file-cannot-be-accessed\/\" rel=\"noopener\">10 Ways To Fix Outlook Data File Cannot Be Accessed<\/a><\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"What_are_the_Solutions_to_Fix_Outlook_Certificate_Error\"><\/span><b>What are the Solutions to Fix Outlook Certificate Error?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">You must be worried about how to fix the Outlook certificate error. Well, don\u2019t be. Because you need not be an expert in computers. If you have basic technical knowledge that would be enough.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Give a shot to the solutions mentioned below to fix the error.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Solution_1_Certificate_Name_Verification\"><\/span><b>Solution 1: Certificate Name Verification<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">To establish a connection between the mail server and email client, verify the certification name. It is one of the common reasons, certificate error occurs.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Always pay attention to the certificate name. Check if that matches the mail server you are trying to establish a connection with.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Follow the steps below.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click on the security warning box to \u2018<\/span><b>view certificate<\/b><span style=\"font-weight: 400;\">\u2019.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click on \u201c<\/span><b>Issued to name<\/b><span style=\"font-weight: 400;\">\u201d to see if the certification name matches or not.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">In case the name does not match, change it.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Restart the application and see if it works.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Hopefully, it works for you. However, if you still encounter the issue, move to the next solution.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>Note:<\/b><span style=\"font-weight: 400;\"> In case the certificate has multiple names, the error may reappear. Hence, try using all the names. Nonetheless, if none of them works out, contact your Internet Service Provider. Confirm if the name has been changed already.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Solution_2_Use_Domain_Name_of_Your_Hosting_as_Mail_Server\"><\/span><b>Solution 2: Use Domain Name of Your Hosting as Mail Server<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Usually, web hosting companies have several mail servers. Over these servers, they operate several domains. For all domains to connect, they have a single address. And that\u2019s where the issue of error occurs.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Web hosting companies do not spend on renewing SSL certificates for each domain. They maintain a single address that is their domain as SSL certified.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Therefore, if you try to access via your domain name, you will receive an error. To escape the error use their domain name.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Solution_3_Add_Non-SSL_port\"><\/span><b>Solution 3: Add Non-SSL port<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">As mentioned before, many schools and colleges\/universities put restrictions on some mail servers. Along with that, they also restrict some ports, for instance, SSL POP port 995, IMAP 993, and SMTP 465. If you go through those ports, you will receive a certificate error.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">To deal with such situations, you can add non-SSL ports, for instance, POP 110, IMAP 143, and SMTP 587. Once you are done adding the SSL ports, you can fix the error.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Solution_4_Change_the_Outgoing_SMTP_Port\"><\/span><b>Solution 4:\u00a0 Change the Outgoing SMTP Port<\/b><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">If you are using SMTP 25, you may receive an error. Because many internet service providers block SMTP 25 for many reasons like spamming.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Hence, to escape the error you need to change the outgoing SMTP port to any other port. To change the outgoing SMTP port, follow the steps below.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Head to <\/span><b>File<\/b><span style=\"font-weight: 400;\">.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Click on the Info tab and move to Account settings.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-1.png\" alt=\"Change the Outgoing SMTP Port 1\" width=\"800\" height=\"450\" class=\"alignnone size-full wp-image-1920\" srcset=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-1.png 800w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-1-300x169.png 300w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-1-768x432.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Through the drop-down list, select your email account and click on Change.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Further, click on more settings and select <\/span><b>Advance<\/b><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-2.png\" alt=\"Change the Outgoing SMTP Port 2\" width=\"800\" height=\"450\" class=\"alignnone size-full wp-image-1921\" srcset=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-2.png 800w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-2-300x169.png 300w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-2-768x432.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Here, you can change the Outgoing SMTP port to any port for example 26.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-3.png\" alt=\"Change the Outgoing SMTP Port 3\" width=\"800\" height=\"450\" class=\"alignnone size-full wp-image-1922\" srcset=\"https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-3.png 800w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-3-300x169.png 300w, https:\/\/www.emailsupport.us\/blog\/wp-content\/uploads\/2021\/09\/Change-the-Outgoing-SMTP-Port-3-768x432.png 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Once changed, click <\/span><b>OK<\/b><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"Outlook_Certificate_Error_Due_to_Corrupted_PST_Files\"><\/span><b>Outlook Certificate Error Due to Corrupted PST Files<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Not all errors occur due to the above-mentioned reasons. It can also be a corrupted PST file. However, its solution is temporary and unreliable. Hence, to fix the certificate error you need a robust solution.\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">The only robust solution is the Outlook PST Repair tool. It is one reliable software that can repair both damaged and corrupted PST files effectively.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"When_Should_You_Install_or_Not_Install_a_Certificate\"><\/span><b>When Should You Install or Not Install a Certificate?<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Not all certificates need to be installed. There are several mail servers that do not require you to install a certificate. Such servers:<\/span><\/p>\n<ol style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Either has a custom certificate.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Or a certificate generated for a particular mail server.\u00a0<\/span><\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">However, if you wish to install a certificate, install \u2018Self-signed Certificate\u2019. Self-signed certificates are for those who have no certificate generated by a Certificate Authority and show a certificate error.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Nonetheless, such an error may occur for any reason. Therefore we have provided how to fix an outlook certificate error. The above-mentioned solutions are easy nuts to crack. Hence, you can troubleshoot the error on your own. We at our end also offer full-time services. If you are looking for the same, connect with our <strong><a target=\"_blank\" href=\"https:\/\/www.emailsupport.us\/microsoft-outlook-support\" rel=\"noopener\">Outlook support<\/a><\/strong> team.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Outlook certificate error majorly occurs when you are connecting to an insecure email server or have network issues. It can also occur due to the wrong hostname, for instance, your name in place of your company hosting server name. You must have come across a message that says \u2018The server [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1909,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[257],"tags":[618,617,619,620],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.10 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fix Outlook Certificate Error - [Troubleshooting Guide 2021]<\/title>\n<meta name=\"description\" content=\"Outlook Certificate Error occurs due to an insecure email server or corrupted PST file. 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