ERR_NGROK_7112: The hostport HOSTPORT has port out of range: PORT is not in range 1-65535 - ngrok documentation

What does ERR_NGROK_7112 mean?

ngrok returns ERR_NGROK_7112 with this message:

The hostport <HOSTPORT> has port out of range: <PORT> is not in range 1-65535.

Where can I get more help with ERR_NGROK_7112?

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