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How To Fix Outlook Certificate Error?

If you see the ‘Server you are connected to is using a security certificate that cannot be verified’ message on the screen, it indicates that the security certificate of your email server is either invalid or expired. Carry out the steps to fix the Outlook certificate error.

Outlook certificate error
  • Click the View Certificate button on the Internet Security Warning dialog box.
  • If the issue is due to an incorrect domain, click the OK option followed by the Yes option.
  • The solution to resolve the Outlook certificate error is given on this page.

Step 1

  • If you are using a Webmail account, access cPanel and get the hostname under the Secure SSL/TLS Settings section.
  • If you are using any other email account, open the Command Prompt screen on your Windows computer and enter ‘ping mail.yourservername.com’ without the single quotes.
  • Now, you will see the server name of your email account.

Step 2

  • Note: If the server name does not match the server name in Outlook, you have to change it.
  • In Microsoft Outlook, click the File tab at the upper-left corner of the screen.
  • Click the Account Settings drop-down menu and choose the Account Settings option.

Step 3

  • Select your email account from the Emails section.
  • Change the incoming mail server name as well as the outgoing server name.

Step 4

  • Click More Settings followed by Advanced and check if all the details are correct.
  • If not, change them and click the OK option to save the altered settings.

Step 5

Click Next in the POP and IMAP Account Settings window.

Step 6

  • Wait until you see the ‘Congratulations! All tests completed successfully’ message on the screen.
  • Click Close and then click Finish to exit Outlook.

Step 7

  • Relaunch Outlook and check if the issue has been resolved.
  • If you have any doubts in resolving the Outlook certificate error, click the Call button to get technical assistance from our support member.