Unable to connect to RD Gateway , connecting to Desktop or RemoteApp in Remote Desktop Services Infrastructure
Reviewing Event Viewer – Microsoft-Windows-TerminalServices-Gateway/Operational
Incoming connection requests, indicated by event ID’s 312, but the connection does not authenticate successfully
Reviewing the LAN Manager Authentication Level you’ll see the “Send LM & NTLM – use NTLMv2 session Security if negotiated” will be set.
This is not the default setting by may have been set on clients to improve/resolve legacy compatibility problems.
Adjust the NTLM Manager setting on the client to be “Clients use only NTLMv2 authentication” – Any of these options will resolve the issue as client will be using NTLMv2 only which is required by default on RD Gateway
If your unable to change the client NTLM settings as per option 1. Add the following registry keys on the RD Gateway Server
HKLM\Software\Microsoft\WindowsNT\CurrentVersion\TerminalServerGateway\Config\Core Type: REG_DWORD Name: EnforceChannelBinding VALUE: 0 (Decimal)
This only applies when a reboot has been completed on the Server.
This will force the RD Gateway to recieve and process NTLMv1 requests.