What does Windows error code 7067 (ERROR_CTX_CDM_DISCONNECT) mean?

ERROR_CTX_CDM_DISCONNECT

The Client Drive Mapping Service Has Disconnected on Terminal Connection.

ERROR_CTX_CDM_DISCONNECT belongs to legacy Remote Desktop Services and Terminal Services session handling. A diagnosis of this result must connect the condition to the producing API, current state, object identity, and first lower-level diagnostic.

This result is Win32 error 7067 (0x00001B9B) in legacy Remote Desktop Services and Terminal Services session handling. Interpret it at the call that produced it and use the system message above as the immediate condition rather than as a complete root cause.

Where the result appears

• processing a Client Drive Mapping service disconnection event for a Remote Desktop session.
• applying a user or server configuration that enables the relevant legacy feature.
• handling a session transition or device response in the Terminal Services stack.
• diagnosing a wrapper that translates a WTS or connection result into Win32 form.

State boundary to prove

This result applies to a Client Drive Mapping service disconnection event for a Remote Desktop session and does not by itself prove that the entire server, directory, disk, session, or application is unavailable. The state boundary to prove for it is whether the drive-mapping channel is closed and dependent handles are invalidated cleanly. Use session transition and reason, open redirected-file handles, and client and network state as independent evidence. When evidence for it disagrees, preserve timestamps and investigate the transition instead of selecting the most convenient value.

Likely causes

• the RDP session disconnected.
• client drive redirection was disabled.
• the virtual channel failed or was reset.
• a user logged off or reconnected from another client.

Diagnostic sequence

1. capture error 7067 immediately at the API boundary and record the operation that was attempted.
2. identify the exact owner of a Client Drive Mapping service disconnection event for a Remote Desktop session, including object generation, server, path, session, replica, or client context.
3. collect session transition and reason before restarting a service or changing configuration.
4. compare open redirected-file handles with the documented or observed precondition.
5. correlate client and network state with TerminalServices operational logs, session and user-configuration records, device or modem diagnostics, and the caller’s connection trace.
6. determine whether side effects occurred and verify recovery after changing one responsible condition.

Evidence to collect

• session transition and reason.
• open redirected-file handles.
• client and network state.
• effective redirection policy before disconnect.

Correlate it with TerminalServices operational logs, session and user-configuration records, device or modem diagnostics, and the caller’s connection trace. Keep the first detailed status even when a later wrapper translates it to error 7067; the first status often distinguishes transport, authorization, storage, schema, state, and application-integrity causes that share the same final Win32 result.

Handling, retry, and recovery

The recovery objective is to treat the result as a notification, close or fail redirected I/O cleanly, and rebuild mappings only after a later connect event.

Retry it only after the recorded condition changes and completion state is known. Idempotent queries may be repeated after recovery, but mutations require a state check first; backoff cannot repair malformed input, corruption, missing structure, or policy rejection.

Telemetry and support fields

• record ctx_cdm_disconnect_api for the producing function or management operation.
• record ctx_cdm_disconnect_target for the file, log, session, replica, object, or server identity.
• record ctx_cdm_disconnect_state_before and ctx_cdm_disconnect_requested_transition.
• record ctx_cdm_disconnect_first_status for the earliest lower-level diagnostic.

For support escalation involving it, retain decimal 7067, hexadecimal 0x00001B9B, the API, UTC time, target identity, and first subsystem-specific status. Include the smallest reproducible request and evidence that distinguishes this condition from nearby codes. In the context of it, several modem-related values describe legacy callback functionality. they should be interpreted in that historical configuration context rather than as a generic modern rdp network failure.

Difference from nearby results

ERROR_CTX_CDM_CONNECT announces establishment of the same virtual channel

Practical validation scenario

A process keeps a file open on a redirected drive when the user disconnects. Handling this event closes the stale handle and prevents later writes from targeting a vanished mapping. The negative test should preserve the responsible condition and reproduce it; the recovery test should change only the identified cause, repeat the same operation, and verify both success and the absence of an unintended partial side effect.

Developer and administrator guidance

Administrators handling it should first decide whether the legacy callback or redirection feature is still required. Developers should treat connection-state notifications as state transitions and device failures as component-specific results instead of mapping every value to a generic RDP network outage. Code that exposes it through RPC, JSON, REST, PowerShell, or another protocol should preserve the Win32 domain, decimal 7067, hexadecimal 0x00001B9B, and original component diagnostic.

References

• Microsoft: Win32 system error range containing this code — official context relevant to it.
• Microsoft: Remote Desktop Services API — official context relevant to it.
• Microsoft: WTS configuration classes — official context relevant to it.
• Microsoft: WTSAPI32 reference — official context relevant to it.

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