Ah i see, thank you!
I just dug up the logs. After I found out in which file I should search for it I noticed these lines:
ERROR - [CERT] PKCS12_parse failed: error:0308010C:digital envelope routines::unsupported
ERROR - [CERT] Found a user-provided certificate, but couldn’t install it.
and right after that that I stumbled upon SSL became broken after latest PMS Update - #14 by plentyoftimeto69
So yes, I just made that assumption and you pointed me that out.
My pfx-file is causing the issue. Will try to make a new p12 file tomorrow. But I won’t enter a password as command parameter at any time if I can avoid it 
