ERR_NGROK_443: ACME Challenge RECORD CNAME record not found, A record IPS found

What does ERR_NGROK_443 mean?

ngrok returns ERR_NGROK_443 with this message:

ACME Challenge <RECORD> CNAME record not found, A record <IPS> found

Troubleshoot ERR_NGROK_443 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.