We have a osx server configured with SSL cert and enabled Xcode. Everything worked fine before updating OSX Server to 3.2.1 and Xcode 6.0.1.
The problem we have is that
Had SSL certificate installed on OS X Server, got this problem after updating OS X. Fixed it by re-adding p12 certificate in Server app -> Certificates, then reboot. Certificate can be imported from Keychain app.