Using Self-Signed SSL Certificates

By default, all machines in a CircleCI Enterprise installation verify SSL certs for the GitHub Enterprise instance. If you’re using a self-signed cert, or using a custom CA root, you can select the “HTTPS (with self-signed certificate)” option in the System Console at port 8800. You also need to export CIRCLE_IGNORE_CERT_HOST=insecure-ghe.example.com on builder machines (replacing insecure-ghe.example.com below with the host of your GitHub Enterprise instance).

See this doc for details on setting builder machine environment variables.