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STATUS_CTX_INVALID_PD
The Terminal Services protocol driver entry is invalid
A protocol driver in this context is part of the server-side Terminal Services connection stack, not an application DLL selected by the user. The status points to connection-stack configuration or component registration.
This is different from an RDP wire-format error. The connection may fail before normal protocol negotiation if the service cannot load or validate the configured protocol driver for that listener.
What to inspect
- Inspect Remote Desktop Services listener configuration and installed role components.
- Check service startup and system event logs around TermService initialization.
- Verify that the failure follows a role change, update, driver replacement, or hardening baseline.
References
- Microsoft: Remote Desktop Services overview
- Microsoft: Terminal Services API portal
- Microsoft Open Specifications: NTSTATUS values
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