Article ID: 198564 - View products that this article applies to.
This article was previously published under Q198564
When you try to make a Secure Socket Layer (SSL) connection to an Exchange Server 5.0 or 5.5 computer through POP3, IMAP4, LDAP, SMTP, or NNTP, the following pop-up error message may be displayed on the mail client:
The server you are connected to is using a security certificate that does not match its Internet address, do you want to continue using this server?
YES or NO
The client verifies that the server certificate is from a certifying authority and then uses the certificate to send a message to authenticate the server (to verify it is who it claims to be). If the server does not pass the authentication process, the client will typically inform the user the server is not who it claims to be.
To work around this problem, perform the following steps:
When generating a certificate, the user must define a Common Name, which is the fully qualified domain name used for DNS lookups of the server (such as mail1.microsoft.com). This information is used by mail clients to identify an e-mail domain. If you change this name within a DNS server, then a new certificate must be created.
For more information on protocol authentication, please see the following Microsoft Knowledge Base article:
(https://support.microsoft.com/kb/175440/EN-US/ )XFOR: Protocol Authentication on Exchange Server
Article ID: 198564 - Last Review: October 28, 2006 - Revision: 3.3
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.