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 Event ID 393 - The federation server proxy could not establish a trust with the Federation Service https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/dn584107(v=ws.11)?redirectedfrom=MSDN https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=ADFS ISSUE: We are performing a brand new deployment of Web Application proxy role on a Windows Server 2012 R2 machine. The Application Proxy Server is in a workgroup machine, while the ADFS server is running on a domain-joined windows 2012 R2 server. For information on the installation pre-requisites and steps, I would suggest you to review the TechNet documentation available  here.   Now back to the issue,we took the PowerShell approach to install the Web application Proxy role. Install –WebapplicationProxy –certificateThumbprint <Hashvalue> FederationServicename <name of the adfsservice > When we ran this command let, we encountered the follo...

ADFS/IdS Troubleshooting and Common Problems: https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/ff641685(v=ws.10)?redirectedfrom=MSDN Applies To: Active Directory Federation Services (AD FS) 2.0 Before you begin the troubleshooting process, we recommend that you first try to configure Active Directory Federation Services (AD FS) 2.0 for troubleshooting and check for known common issues that might prevent normal functioning of the Federation Service. For detailed instructions for configuring and performing related system checks, see  Configuring Computers for Troubleshooting AD FS 2.0  and  Things to Check Before Troubleshooting AD FS 2.0 . Troubleshooting trust establishment failures The following table provides troubleshooting guidance for specific error event messages or other issues that you may encounter if you are having problems with establishing trusts with AD FS 2.0. TROUBLESHOOTING TRUST EST...