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ERROR_CTX_MODEM_INF_NOT_FOUND
The MODEM.INF file was not found.
ERROR_CTX_MODEM_INF_NOT_FOUND is Win32 error 7009 (0x00001B61) and concerns legacy Remote Desktop modem callback configuration.
What to verify
Verify whether the system can locate the MODEM.INF data required to identify and initialize the configured modem. Check resolved MODEM.INF path, Windows component and driver installation state, and Terminal Services callback configuration.
Likely causes
- the expected modem information file is absent.
- the installation points to the wrong Windows directory.
- legacy modem components were removed.
- file access or servicing left the data unavailable.
Troubleshooting steps
- Collect resolved MODEM.INF path.
- Record Windows component and driver installation state.
- Correlate Terminal Services callback configuration with TerminalServices operational logs, session and user-configuration records, device or modem diagnostics, and the caller’s connection trace.
Handling, retry, and recovery
Restore the matching legacy modem components or remove the obsolete callback requirement; do not copy an unrelated MODEM.INF from another Windows build.
Related errors
ERROR_CTX_INVALID_MODEMNAME means the file was found but the configured modem entry was not present
Example
A preserved Remote Desktop callback policy is applied to a rebuilt server that no longer has modem support installed. Removing the obsolete callback policy resolves the connection setup failure.
References
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