Unable to connect with MCP Client node

Questions
1

Hi everyone, I’m having an issue when using the MCP Client node in n8n.

  • MCP endpoint source: IBM MCP Gateway, which generates an SSE (Server-Sent Events) Endpoint.

  • Test result: I tested the SSE URL with n8n’s HTTP Request node, and it works fine (so the URL and authentication should be correct).

  • Problem: When I switch to the MCP Client node, it keeps failing to connect. The error message is:

    Error in sub-node ‘MCP Client‘
    Could not connect to your MCP server

My questions:

  1. Has anyone successfully connected the MCP Client node to an IBM MCP Gateway SSE Endpoint?

  2. What other ways can I further test or troubleshoot this?

I’ve been stuck on this for a while, any guidance would be greatly appreciated! :folded_hands:

2

Hello , Im facing exactly the same issue with a custom spring boot MCP server deployed in OpenShift .
Did you by any chance fixed this issue .
Ive tried to disable the gzip compression at the Openshift Route (Ingress) level , at the server level without any success .
Thank you.

3

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