ERR_NGROK_6705: The agent ingress domain "DOMAIN" must be a third party domain, you may not enter a domain controlled by ngrok

What does ERR_NGROK_6705 mean?

ngrok returns ERR_NGROK_6705 with this message:

The agent ingress domain "<DOMAIN>" must be a third party domain, you may not enter a domain controlled by ngrok.

Troubleshoot ERR_NGROK_6705 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.