ERR_NGROK_PRIVATE_LINK_HOSTNAME_INVALID: Hostname HOSTNAME is not a valid DNS name

What does ERR_NGROK_PRIVATE_LINK_HOSTNAME_INVALID mean?

ngrok returns ERR_NGROK_PRIVATE_LINK_HOSTNAME_INVALID with this message:

Hostname <HOSTNAME> is not a valid DNS name. Each label must be 1 to 63 letters, digits, or '-', and must not start or end with '-'. Only the first label can be '*'.

Troubleshoot ERR_NGROK_PRIVATE_LINK_HOSTNAME_INVALID 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_PRIVATE_LINK_HOSTNAME_INVALID?

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