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ERROR_CTX_NO_OUTBUF
ERROR_CTX_NO_OUTBUF indicates resource pressure in the Remote Desktop Services session path: the server had no available output buffers for the operation. It is usually transient, but repeated occurrences can point to high session load, a stuck client, or a host resource problem.
What to check
- Check the number and state of active and disconnected sessions when the error occurs.
- Review memory, CPU, networking and TerminalServices events for a broader resource bottleneck.
- Determine whether one client, one application, or all sessions trigger the problem before restarting services.
qwinsta
Get-Service TermServiceMicrosoft: Remote Desktop Services system error codes
Microsoft: Troubleshoot Remote Desktop disconnected errors
Microsoft: Remote Desktop Services overview
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