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claude-code - 💡(How to fix) Fix [BUG] Claude Desktop MCP network access regression: LAN connections fail after recent update (EHOSTUNREACH) [1 comments, 2 participants]

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anthropics/claude-code#56433•Fetched 2026-05-06 06:28:10
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Error Message

Error Messages/Logs

  1. Observe error: "connect: no route to host" despite the LAN host being fully
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Claude_MCP_LAN_Bug_Report.docx

What Should Happen?

MCP server subprocesses should have the same LAN network access as any other user process, consistent with behavior in previous app versions.

Error Messages/Logs

Steps to Reproduce

  1. Install any MCP server that connects to a LAN host (e.g., mcp-server-kubernetes targeting a cluster on a private IP)
  2. Configure it in claude_desktop_config.json with correct credentials and network settings
  3. Launch Claude Desktop (either Cowork or Chat mode) and invoke any tool requiring a LAN connection
  4. Observe error: "connect: no route to host" despite the LAN host being fully reachable from the same machine

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude 1.5354.0 (9a9e3d) 2026-04-29T01:14:34.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The issue can likely be resolved by reconfiguring the network settings in claude_desktop_config.json to ensure the MCP server subprocesses have the correct LAN network access.

Guidance

  • Verify that the LAN host is reachable from the machine running Claude Desktop by using a tool like ping or curl to test the connection.
  • Check the claude_desktop_config.json file for any incorrect or missing network settings that may be causing the "connect: no route to host" error.
  • Try configuring the MCP server to use a different network interface or settings to see if it resolves the issue.
  • Review the documentation for the Anthropic API and Claude Code to ensure that the correct configuration options are being used.

Notes

The issue is reported as a regression, suggesting that a previous version of Claude Code worked correctly. However, the last working version is not specified, which may make it more difficult to identify the exact cause of the issue.

Recommendation

Apply workaround: The best course of action is to try reconfiguring the network settings and testing different configurations to find one that works, as the exact cause of the issue is not clear.

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claude-code - 💡(How to fix) Fix [BUG] Claude Desktop MCP network access regression: LAN connections fail after recent update (EHOSTUNREACH) [1 comments, 2 participants]