Hi everyone,
I’m working on an n8n workflow that uses two MCP servers — one for Google Sheets and another for Google Calendar. Each has its own HTTP endpoint configured. However, when I run the workflow, I get the error: **“Could not connect to your MCP server.”
**
https://www.loom.com/share/318f49b40f8e4d6eb4301a5a9f3ad349
I’d appreciate any help figuring out why this happens and how to fix it. Thanks!
Based on the search results from [community.n8n.io](Error “Could not connect to your MCP server” when integrating external tool via SSE in AI Agent - #6 by solomon), this is a known issue with MCP servers using SSE (Server-Sent Events) connections. The main solution is to disable gzip compression for the `/mcp` path in your reverse proxy configuration while keeping it enabled for other paths.
If you’re using Docker, Coolify, Traefik, or Nginx, you’ll need to configure your reverse proxy to handle SSE connections properly. Check out the [GitHub issue]([Bug]: n8n MCP functionality doesn't work due to SSE Gzip compression · Issue #5586 · coollabsio/coolify · GitHub) and community discussions for specific configuration examples for your setup.
For multiple MCP servers, make sure you’re using n8n version 1.93+ which supports native MCP functionality - avoid community MCP nodes as [mentioned here](How to connet multiple mcp servers in one agent).