ERR_NGROK_7121: HTTPS edges can only be associated with reserved domains: HOSTPORT is a TCP address

What does ERR_NGROK_7121 mean?

ngrok returns ERR_NGROK_7121 with this message:

HTTPS edges can only be associated with reserved domains: <HOSTPORT> is a TCP address.

Troubleshoot ERR_NGROK_7121 with your AI agent. Connect it to the ngrok MCP server, then ask what caused the error and how to fix it.

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