ERR_NGROK_455: This subdomain is covered by WILDCARD_DOMAIN however the wildcard's CNAME record resolved to HAVE, should have been WANT - ngrok documentation

What does ERR_NGROK_455 mean?

ngrok returns ERR_NGROK_455 with this message:

This subdomain is covered by <WILDCARD_DOMAIN> however the wildcard's CNAME record resolved to <HAVE>, should have been <WANT>.

Troubleshoot ERR_NGROK_455 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_455?

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