I'm having an issue connecting to the Microsoft Federation Gateway using Exchange 2010 SP3 RU4. The Federation has existed for months without issue and recently lost connection. Autodiscover is working as normal and all certificates are up to date (Federation Certificate is Self-Signed as per Microsoft Recommendation). Running Test-FederationTrust -verbose returns this error.
Test-FederationTrust : Failed to retrieve Federation Metadata from the Microsoft Federation Gateway. This operation will be retried in a few seconds. Last error: System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSl/TLS secure channel. System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure
I have tried removing the Federation but the same error occurs on that CMDLET as well.
Any help is appreciated.