Azure MFA - ADFS Adaptor and pfsvcclientclr.dll Error

Problem Statement:

When using 7.0 version of Azure on-premises MFA server, you may receive an event ID 364 with “Could not load file or assembly 'pfsvcclientclr.dll' or one of its dependencies. The specified module could not be found” error message. 

Complete Error Message

System.IO.FileNotFoundException: Could not load file or assembly 'pfsvcclientclr.dll' or one of its dependencies. The specified module could not be found.

File name: 'pfsvcclientclr.dll'

   at pfadfs.AuthenticationAdapter.IsAvailableForUser(Claim identityClaim, IAuthenticationContext context)

   at Microsoft.IdentityServer.Web.Authentication.External.ExternalAuthenticationHandler.IsAvailableForUser(Claim identityClaim, IAuthenticationContext authContext)

   at Microsoft.IdentityServer.Web.Authentication.External.ExternalAuthenticationHandler.ProcessContext(ProtocolContext context, IAuthenticationContext authContext, IAccountStoreUserData userData)

   at Microsoft.IdentityServer.Web.Authentication.External.ExternalAuthenticationHandler.Process(ProtocolContext context)

   at Microsoft.IdentityServer.Web.Authentication.AuthenticationOptionsHandler.Process(ProtocolContext context)

   at Microsoft.IdentityServer.Web.PassiveProtocolListener.OnGetContext(WrappedHttpListenerContext context)

Resolution:

Install:

1. Visual C++ Redistributable x64 and x86 (https://www.microsoft.com/en-us/download/details.aspx?id=49984 )
2. KB2919355 installed If you are using Windows Server 2012R2 (https://support.microsoft.com/en-us/kb/2919355)
   

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