Public Key Error preventing user from login on to sever

Hello all,

We are experiencing a major issue in our organization. Recently, users started getting warning that their user ids are expiring soon each time they logon to check their mail on Lotus Notes. We also noticed that some of the users ID Files have expired.

But when we renewed or recertified any of the expired or expiring ID files, when the users attempt to login they would get the error message below:

"The subject’s public key in the certificate is not the one stored in our ID file for that entry. Check the local log file for details.

Do you want to access the server anyway?"

And when the user clicks on “Yes” button another error message appears as detailed below:

“Server Error: The signature on the certificate was found to be invalid. Check the log file for details.”

And when we check the log file we don’t see any further details other the error messages above.

We don’t know how we can resolve this problem. We have searched the Domino forums and the net but didn’t get much help. Please kindly assist.

Thanks in anticipation.

Austine