ERR_NGROK_1120: Cannot use '-hostname=HOSTNAME with '-subdomain=SUBDOMAIN parameter

What does ERR_NGROK_1120 mean?

ngrok returns ERR_NGROK_1120 with this message:

Cannot use '-hostname=<HOSTNAME> with '-subdomain=<SUBDOMAIN> parameter.
You may either specify '-hostname=<HOSTNAME> or '-subdomain=<SUBDOMAIN> but not both.

Troubleshoot ERR_NGROK_1120 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_1120?

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