If you can login as root to the command line (through ssh, possibly PuTTy) we should be able to troubleshoot the setup at least.
This might take a while so before we try let us know if you prefer to re-install your server from scratch as it is no good to put time in troubleshooting and the get a “ah, I am going to reinstall”…
So, first: is you OpenLDAP service running?
systemctl start slapd
systemctl status slapd
To install the certs did you follow this article?
Why are you not asking the guy who broke your system to fix it?
Some more details about your error would be helpful. Can you browse the the web-login page? Does it use https with your GoDaddy certificate?
/CV