The target principal name is incorrect – Microsoft Outlook
One of my friends received the following error message when trying to send/receive e-mails in Microsoft Outlook.
The server you are connected to is using a security certificate that cannot be verified.
The target principal name is incorrect.
Once he clicked YES the warning message went away but as soon as Outlook is restarted he received the same warning message again.
The problem here lies in different mail server name being used from the name the certificate has been issued to.
To solve this click on the View Certificate and check the Issued to value.
Now go to Microsoft Outlook and navigate to:
File | Account Setting | Account Setting
Select your e-mail account and click on the Change button.
Change the values of the Incoming and Outgoing (SMTP) server address so it matches the name on the Certificate.
As you might have noticed you probably had a mail.domain.com specified for the Incoming and Outgoing (STMP) server addresses which were different from the name the certificate was issued to.
Once you click Next and Finish the warning message should be gone.
excellent details on how to fix the certificate error in outlook 2019
thank you
This doesn’t work for my issue. Once I implement the change, Outlook will no longer open.
Hi Scully, in that case, I would try reinstalling Microsoft Outlook.
Nice! Thank you.
Solved the issue, thank you!
I’m not finding the Issued to value.
Sweet, worked great. I always assumed my incoming and outgoing servers would need a full uri like mail.mydomain.com; but I changed both to match my cert (mydomain.com) and it worked.
It was actually your comment here that fixed it for me not the article. Changing the url to mydomain.com totally worked. I still have mismatched certificates (mydoman.com vs the cert in webhost.com) but it works. Thank you.