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STATUS_CTX_MODEM_RESPONSE_NO_CARRIER
The modem did not establish or keep carrier
Carrier detect is a physical/link-layer modem condition. In this Terminal Services status, the modem path failed because the remote side did not establish a data carrier or because carrier dropped after connect.
The failure belongs to the dial-up link, not to RDP graphics, credentials, or redirected devices. Modern TCP-based RDP deployments normally should not encounter this unless obsolete modem callback configuration remains.
What to inspect
- Verify the phone line, remote modem endpoint and negotiated data mode.
- Check whether carrier drops only after authentication or immediately after dialing.
- Remove stale callback configuration if modem access is no longer intended.
References
- Microsoft: TAPI portal
- Microsoft: Routing and Remote Access Service
- Microsoft: Terminal Services API portal
- Microsoft Open Specifications: NTSTATUS values
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