I have a Server 2003 CA and 2 Server 2008 R2 Domain Controllers. I am getting the Warning on the DCs (Event ID 64) that the Certificate is expired. I try and renew the certificate and I get an Error (Event ID 16) about the “The signature of the certificate cannot be verified”. My AD is working fine but i would like to clean this up and renew the Cert. I also have Auto-Enroll and Renew enable so not sure why it didn’t renew. Any help would be greatly appreciated.