In my windows server 2008 R2 in the Event Viewer there is an error pertains -ADFS Error ID 684 states-(The AD FS Web Agent was unable to update trust information from the Federation Service.The Federation Service secure sockets layer (SSl) Server Certificate could not be validated. User Action: Varify that the Federation Service SSL server certificate chains to a root certificate that is in the Local Computer Trusted Root Certification Authorities certificates store on the web server. Verify that the SSL certificate is neither expired nor revoked. Verify that the SSL certificate subject matches the host name portion of the Federation Service Uniform Resource locator(URL).MumthazMuhsin