NTSTATUS 0xC000023E (STATUS_PROTOCOL

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The remote system does not support the transport protocol.

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STATUS_HOST_UNREACHABLE	STATUS_PORT_UNREACHABLE

STATUS_PROTOCOL_UNREACHABLE

The remote endpoint cannot be reached with that protocol

These status values come from the Windows Filtering Platform path. For STATUS_PROTOCOL_UNREACHABLE, wFP classifies traffic through layers, filters, provider contexts, sublayers, and callouts; IPsec policy is also configured through WFP at IKE/AuthIP-related layers.

This status describes protocol reachability at the transport/network boundary. The local stack was able to express the request, but the remote side or path does not support the selected protocol.

For STATUS_PROTOCOL_UNREACHABLE, for diagnostics, keep the failing API call, layer or sublayer key, provider context type, filter condition set, callout id, engine state, and whether the Base Filtering Engine, IKEEXT, TCP/IP stack, or L2 path was ready.

What to inspect

Record the protocol, destination address, and port.
Check whether an ICMP protocol-unreachable condition was returned.
Compare this with STATUS_PORT_UNREACHABLE, which is about the destination port rather than protocol support.

References for STATUS_PROTOCOL_UNREACHABLE

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