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STATUS_CONNECTION_IN_USE
STATUS_CONNECTION_IN_USE is a cleanup and lifetime error for a redirected drive. It is not merely a statement that a network connection exists: the system refused to force-close it because open directory handles remained and the caller did not request enough force for that operation.
How to narrow it down
Find the processes, shells, services and background workers holding directory handles on the redirected drive. Directory handles matter because they keep the remote namespace context alive even if no ordinary file is visibly open. Closing a mapped drive without accounting for those handles can disrupt callers that still expect their current directory or enumeration state.
Prefer orderly teardown: stop workers, close handles, wait for clients to finish, then disconnect. Escalated force should be reserved for an intentional recovery action with an understood impact on every process using the connection.
Evidence that matters
- Enumerate open directory and file handles on the redirected drive.
- Stop or coordinate dependent processes before disconnecting the mapping.
- Document the force level and expected impact before escalating it.
References
- Microsoft Open Specifications: NTSTATUS reference
- Microsoft: SMB overview
- Microsoft: Get-SmbConnection
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