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ERROR_PRINT_MONITOR_IN_USE
A port monitor sits below the spooler and provides the communication path used by printer ports. Removing it is therefore different from deleting an unused management entry: printer ports and queues can still depend on the monitor's implementation.
DeleteMonitor is the management API for removing a monitor. When the subsystem reports that the monitor is in use, first map the dependency chain from printer queue to configured port and from port to monitor instead of deleting DLLs from spooler directories.
Find the remaining dependency
- Enumerate monitors, ports, and printer queues on the same server; keep server scope consistent throughout the comparison.
- Identify queues still configured on ports owned by the target monitor and migrate or remove those queues deliberately.
- Check administrative scripts and remote print-server tooling for objects recreated after cleanup.
- Only call the documented monitor-removal path after dependent configuration has been removed; manual file deletion can leave a registered but unusable monitor.
DeleteMonitor · Microsoft Port Monitors · Samba rpcclient print-server inventory commands
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