Desktop app cannot reach LAN IP addresses - EHOSTUNREACH on all 192.168.x.x connections #25908

Description

The OpenCode desktop app cannot connect to MCP servers hosted on a local network. Even when pointing directly at a LAN IP (e.g. http://192.168.1.x:port), the desktop app fails with EHOSTUNREACH. The same configuration works correctly when using the terminal version of OpenCode.

This affects both type: "remote" and type: "local" (with mcp-remote) MCP configurations. The error is consistent regardless of whether a domain name or direct IP is used, confirming the issue is network isolation in the desktop app itself, not DNS resolution.

The terminal version connects successfully using the same opencode.json config, confirming the MCP server is working correctly, and the problem is specific to the desktop app's sandboxed network environment.

Plugins

mcp-remote

OpenCode version

Version 1.14.39 (1.14.39)

Steps to reproduce

1. Set up an MCP server on your local network (e.g. http://192.168.1.x:8000/)
2. Configure it in opencode.json as type: "remote" with the direct LAN IP
3. Launch the OpenCode desktop app
4. Observe MCP fails with SSE error: TypeError: fetch failed: connect EHOSTUNREACH 192.168.x.x:port
5. Run the same config using opencode in a terminal - it connects successfully

Screenshot and/or share link

Operating System

macOS 15.7.4 (24G517)

Terminal

N/A - issue is specific to the desktop app