The AD FS Web Agent was unable to update trust information from the Federation Service. A serious error has occurred. Federation ...

Windows 7

The AD FS Web Agent was unable to update trust information from the Federation Service. A serious error has occurred. 
Federation Service URL: %1 

If this failure occurs during startup, no users will be authenticated until the Federation Service can be contacted. If the Federation Service cannot be contacted, the Web agent will continue to authenticate users with the existing trust information, and it will attempt this operation again at a later time. 

This condition occurs when an unexpected exception is thrown from the GetFsTrustInformation Web method call to the Federation Service. 

Additional Data 
Exception information: 
%2

The AD FS Web Agent for Windows NT token-based applications was unable to authenticate a client token. User Action Look for ... The AD FS Web Agent Internet Server Application Programming Interface (ISAPI) Extension encountered a serious error. The ... The AD FS Web Agent Internet Server Application Programming Interface (ISAPI) Extension was unable to obtain a Windows NT ... The AD FS Web Agent was unable to update trust information from the Federation Service. A Hypertext Transfer Protocol (HTTP) ... The AD FS Web Agent was unable to update trust information from the Federation Service. A serious error has occurred. Federation ... The AD FS Web Agent was unable to update trust information from the Federation Service. An InvalidOperationException occurred. ... The AD FS Web Agent was unable to update trust information from the Federation Service. The Federation Service returned an ... The AD FS Web Agent was unable to update trust information from the Federation Service. The Federation Service Secure Sockets ... The AD LDS instance %1 is the last instance in this configuration set. If you remove the instance, you will also remove the ...