ERR_NGROK_3502: The forward-internal action can't forward between endpoints that use different protocols - ngrok documentation

What does ERR_NGROK_3502 mean?

ngrok returns ERR_NGROK_3502 with this message:

The forward-internal action can't forward between endpoints that use different protocols. This endpoint uses <PARENTPROTO>, and the endpoint you're forwarding to uses <TARGETPROTO>.

Troubleshoot ERR_NGROK_3502 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

Where can I get more help with ERR_NGROK_3502?

Email support@ngrok.com and include the error code.