Updates KB4534297/KB4534309 Break RDS through Web Application Proxy on Server 2012 R2
We have Remote Desktop https://docs.microsoft.com/en-us/azure/active-directory/manage-apps/application-proxy-integrate-with-remote-desktop-services through Web Application Proxy, both running on Server 2012 R2. The RDS application in WAP is configured for pass-through authentication so users can connect from both Windows and non-Windows ("rich apps" on Android/iOS/Mac) devices. This has been working for the past few years without issue. After installing recent update KB4534309 (or the rollup that contains it, KB4534297), the non-Windows clients are unable to connect. They show error 0x3000008 during the "initiating remote connection" phase: We couldn't connect to the gateway because of an error. If this keeps happening, ask your admin or tech support for help. Has anyone experienced this or figured out a way to fix it?