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ERROR_CTX_CDM_CONNECT
The Client Drive Mapping Service Has Connected on Terminal Connection.
ERROR_CTX_CDM_CONNECT is Win32 error 7066 (0x00001B9A).
What to verify
Verify whether the drive-mapping virtual channel is connected and its state is interpreted as a notification rather than a failure. Check session ID and user, client name and protocol, and effective drive-redirection policy.
Likely causes
- a user session enables client drive redirection.
- the RDP virtual channel is established after logon.
- policy permits device redirection.
- a reconnect restores the client drive mapping channel.
Troubleshooting steps
- Collect session ID and user.
- Record client name and protocol.
- Correlate effective drive-redirection policy with TerminalServices operational logs, session and user-configuration records, device or modem diagnostics, and the caller’s connection trace.
Handling, retry, and recovery
Treat the value as a state transition, enumerate the resulting mappings, and report an error only if the expected devices fail to appear.
Related errors
ERROR_CTX_CDM_DISCONNECT reports the opposite channel transition
Example
A monitoring component receives this value during session logon. It records the channel connection and then verifies which client drives were actually published.
References
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