ERR_NGROK_18023: Invalid port for URL with scheme CURRENTSCHEME, allowed ports are WANTPORT - ngrok documentation

What does ERR_NGROK_18023 mean?

ngrok returns ERR_NGROK_18023 with this message:

Invalid port for URL with scheme <CURRENTSCHEME>, allowed ports are <WANTPORT>.

Troubleshoot ERR_NGROK_18023 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_18023?

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