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ERROR_MAX_SESSIONS_REACHED
No additional session can be created
ERROR_MAX_SESSIONS_REACHED is a Win32 system result. The limiting session may belong to a remote service, terminal environment, network subsystem, application broker, or another component enforcing a concurrent-session cap.
What the result means
The system or service has reached its configured maximum number of sessions.
What to check
- Identify which service returned the error and what it calls a session.
- Measure active, idle, disconnected, and orphaned sessions.
- Check licensing and configured concurrency limits before changing them.
- Look for clients that fail to log off or release sessions after network loss.
Recommended handling
Close or expire unused sessions, queue the request, or increase a supported limit after capacity review. Avoid tight retry loops that add load while capacity is exhausted.
Developer notes
Expose session-capacity telemetry and deterministic cleanup. Use bounded leases or heartbeats for remote sessions so abrupt client failure does not permanently consume capacity.
References
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