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 Hypertext Transfer Protocol (HTTP) or networking error has occurred. 
Federation Service URL: %1 
WebExceptionStatus value: %2 
WebException message: %3 

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 be authenticated users with the existing trust information, and it will attempt this operation again at a later time. 

User Action 
Verify that the Federation Service Uniform Resource Locator (URL) is properly configured, the Federation Service is started, and the Federation Service can be contacted from this computer.