GitHub Enterprise uses a self-signed SSL certificate to secure the configuration of your instance. You may see a warning about this in your web browser on the next screen, but rest assured this is expected and all is well.
Verifying the certificate's authenticity
$ ssh -p122 admin@ $ openssl x509 -fingerprint -in /etc/haproxy/ssl.crt -noout # SHA1 Fingerprint=D5:5F:A4:EB:4B:0A:FC:08:F6:F2:4E:6F:2B:01:4F:7C:74:64:E4:02