ERR_NGROK_356: The credential ACL policy does not permit binding random TCP addresses

What does ERR_NGROK_356 mean?

ngrok returns ERR_NGROK_356 with this message:

The credential ACL policy does not permit binding random TCP addresses.
Credential ID: <ID>

Troubleshoot ERR_NGROK_356 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.