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STATUS_THREAD_NOT_IN_SESSION
The thread has no suitable session context
Some operations require a thread to execute in or refer to a particular session context. This status indicates the required association is missing.
Typical causes include running user-interaction code from a service thread, using a worker thread before it enters the target session, or losing the intended session after logoff or reconnect.
What to inspect
- Identify the thread, process and target session at the point of failure.
- Avoid UI or desktop work directly from session 0 service threads.
- Use documented WTS/session APIs to discover and select the active user session.
References
- Microsoft: Kernel object namespaces
- Microsoft: Terminal Services API portal
- Microsoft: WTSEnumerateSessions
- Microsoft Open Specifications: NTSTATUS values
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