If you have an encrypted server then you need to have a certification for the client. Please see this document, it might be helpful –
If you look in [C:\ProgramData\Milestone\](file:C:/ProgramData/Milestone/) , there is a folder for each major server component and there are log files. Also, debug logs is [C:\ProgramData\Milestone\XProtect](file:C:/ProgramData/Milestone/XProtect) Management Server\Logs.
You can access most server logs through the Management Client. See -
I can’t tell which log would be most useful for you but please explore the above.