Today I've did... well, a stupid thing. I was so annoyed with Windows telemetry and its consumption of my resources, and dozens other similar sht (thank you Microsoft!), that I've ran Blackbird to solve the things for me. It probably did the trick, but since then I cannot RDP from this PC anymore - I'm always getting some authentication issue:
"An authentication error has occurred. The function requested is not supported."
Windows event log (Applications and Services Logs / Microsoft / Windows / TerminalServices-ClientActiveXCore / Microsoft-Windows-TerminalServices-RDPClient/Operational) shows the following warnings (all with Event ID 226):
RDPClient_SSL: An error was encountered when transitioning from TsSslStateHandshakeStart to TsSslStateDisconnecting in response to TsSslEventStartHandshakeFailed (error code 0x80004005). RDPClient_TCP: An error was encountered when transitioning from TcpStateFrontAuth to TcpStateFailure in response to TcpEventFrontAuthFailed (error code 0x80090302). RDPClient_TCP: An error was encountered when transitioning from TcpStateExpectingX244CC to TcpStateFailure in response to TcpEventErrorProcessingX224CC (error code 0x80004005).
Does anyone know how to resolve this, and get RDP running again?
Bit more info: RDP client successfully initiates communication with the server (it is not a connection issue), prompts me for credentials, and fails with mentioned error when it tries to authenticate.