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.

References

• Microsoft: System error codes 0–499