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=5D:32:87:D2:A2:52:F5:EB:4B:82:33:A3:BD:5E:B0:05:8D:FB:AC:1D