Error updating local ID file on Server

I have a server running 5.0.11 (so I can use Sametime - that’s the only way, right?) and my main server cluster pair running 6.5.1 (including the server that created the other servers).

I needed to change the password for my server to a password that was too simple for the original mandatory password settings, so I needed to recertify the server in order to reduce the password settings. Now, every time the 5.0.11 server starts or performs some other operations (such as Searching Administration Requests database), it gives the following error:

“Error updating local ID file: The information in the supplied certificates from the Address Book entry is out of date”

I saw a post on receiving this message on a client, but nothing about servers. What does this mean, is it serious, and if so, how do I fix it?

Thanks for any help,

Colin