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STATUS_CTX_CDM_DISCONNECT
A redirected client drive channel disconnected
This status marks loss of the client drive mapping service inside a Remote Desktop session. Files opened through redirected paths can start failing even when server-side local storage remains healthy.
The cause can be a deliberate client setting change, virtual-channel teardown, network disconnect, session logoff, or a policy transition that stops exposing client file systems to the server session.
What to inspect
- Identify whether the whole RDP session disconnected or only the drive-redirection virtual channel changed.
- Check whether the failing path is a redirected drive rather than a server-local volume.
- Review client and server redirection policy before treating it as a generic file system outage.
References
- Microsoft Open Specifications: MS-RDPEFS drive redirection
- Microsoft Open Specifications: MS-RDPBCGR
- Microsoft: Terminal Services API portal
- Microsoft Open Specifications: NTSTATUS values
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