What does Windows error code 229 (ERROR_PIPE_LOCAL) mean?

ERROR_PIPE_LOCAL

What ERROR_PIPE_LOCAL means

The named pipe endpoint is local rather than remote. This informational or error result appears when an operation requires a remote pipe but the supplied handle refers to a pipe on the local machine. It is about endpoint topology, not basic pipe validity.

Common causes

• A server name resolves to the local computer
• The application opens \.\pipe while expecting a remote endpoint
• Connection fallback silently changes a remote path to local
• A test environment uses the same host for client and server

How to investigate

1. Record the exact canonical pipe path and resolved server identity
2. Compare local computer aliases, DNS names, and loopback resolution
3. Check whether fallback logic rewrites the endpoint
4. Verify which pipe operations require a remote transport

Developer guidance

Normalize endpoint identity before selecting remote-only operations. Treat local named pipes as a distinct transport mode and avoid assuming that a UNC-looking alias guarantees a network hop.

Administrator and support guidance

Review host aliases and deployment topology. The pipe service may be healthy; the client may simply be connected locally.

How this code differs from related results

This code does not mean the pipe is disconnected or busy. It specifically reports that the endpoint is local.

Evidence worth collecting

For ERROR_PIPE_LOCAL, begin the trace at the operation where a server name resolves to the local computer. For ERROR_PIPE_LOCAL, preserve the exact API boundary, numeric result, process and thread identifiers, relevant object state, and the component version. The first verification point should be to record the exact canonical pipe path and resolved server identity. This evidence distinguishes the specific ERROR_PIPE_LOCAL contract from a later secondary failure.

Recovery and verification

Recovery for ERROR_PIPE_LOCAL should address the observed condition rather than merely retrying the same call. After the change, reproduce the scenario in which a server name resolves to the local computer, then confirm that the intended operation completes and that cleanup returns all associated resources. For ERROR_PIPE_LOCAL, also verify that the next repeated operation follows the same successful path without increasing the resource class implicated by this result.

When to escalate

Escalate ERROR_PIPE_LOCAL with a minimal reproduction focused on the failing pipe or compatibility boundary. Include the operating-system build, binary architecture, runtime or compatibility-layer version, the exact input values, and a timestamped trace showing a server name resolves to the local computer. For the ERROR_PIPE_LOCAL escalation record, note whether changing concurrency, object lifetime, target process, module set, or endpoint location alters the result.

References

• Microsoft: System error codes 0–499

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