Symptoms

This issue occurs when Federal Information Processing Standards (FIPS) for Response Group Service (RGS) is enabled in a Microsoft Skype for Business Server 2015 environment.

Additionally, when you establish application endpoints, you may see the following exception:

sip:RtcApplication-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX@domain.com
sip:RtcApplication- XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX@domain.com
sip:RtcApplication- XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX@domain.com
Exception: System.Reflection.TargetInvocationException - System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms.
at System.Security.Cryptography.SHA512Managed..ctor()
--- End of inner exception stack trace ---

at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Security.Cryptography.CryptoConfig.CreateFromName(String name, Object[] args)
at System.Security.Cryptography.SHA512.Create()
at Microsoft.Rtc.Acd.Common.ConsistentHash`2..ctor(Func`2 nodeToHashKeyConverter, Func`2 requestToHashKeyConverter, Int32 virtualNodesMultiplier)
at Microsoft.Rtc.Acd.MatchMaking.PresenceProvider.PresenceComponent.Initialize(IReadOnlyCollection`1 presenceEndpoints, Int32 maxRgsAgentsPerPresenceWatcher)
at Microsoft.Rtc.Acd.MatchMaking.MatchMakingService.Start(IReadOnlyCollection`1 presenceEndpoints)
at Microsoft.Rtc.Acd.AepManager.StartMMAndItsDependencies(IReadOnlyCollection`1 presenceEndpoints)
Cause: Failed to connect to Front End server or the Front End server is misconfigured.
Resolution: Check the Front End server for errors.

Cause

This issue occurs because the MD5 and SHA512Managed classes don’t have FIPS enabled.

Resolution

To fix this issue, install the following cumulative updates:

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