But as i understood from previous posts, you have already tried to login without encryption? Or not? I mean, have you tried to disable SSL at all on server side? Maybe Caitlin should try that.
Server > Server Settings > Security Settings > Client Connection Security - change to Optional or Custom: Not Available (both)
Caitlin, as you are asking how to regenerate them, so do you have them already? Maybe just self-signed certs will do? Then you can generate them (or delete and generate again) in Admin Console.
As i have mentioned in 20 message in my answer for Caitlin, you should go to Server > Server Settings > Server Certificates in Admin Console and then you will see:
One or more certificates are missing. Click here to generate self-signed certificates or here to import a signed certificate and its private key.
Of course, if you don’t have any certificates yet. Then you can click first ‘here’ link and certificates will be generated. Then you’ll have to restart the server (again ‘here’ link) and that’s it.