This sounds as if the SEPM has been reinstalled, and that what is now in the SEPM's config doesn't match the details in the DB.
As Brian says, you'd need the Server Private Key Backup folder's contents from the original install to be able to accurately perform the DR (which is exactly what you're doing here).
Just in case, please also review the DR steps in the article below:
http://www.symantec.com/docs/TECH218407
NOTE: Do not change the certificate if you can avoid it. If you do choose to change the certiicate, then you'll have to replace the communications files on your SEP clients.