After i installed updates for my mac mini server, the web services for the server app wont start, it gives an error massage: "Error Reading Settings"

Question

After i installed updates for my mac mini server, the web services for the server app wont start, it gives an error massage: "Error Reading Settings"
The system logs reads:
Mar 29 22:06:25 server servermgrd[82]: servermgr_web:  Error Domain=XSServerFoundationErrorDomain Code=4 "Failed to read settings: Exception:
          undefined method `downcase' for nil:NilClass
          ." UserInfo=0x7fc547901080 {NSLocalizedDescription=Failed to read settings: Exception:
          undefined method `downcase' for nil:NilClass

Answer 1

To check the local network for some of the common configuration problems, launch Terminal.app and issue the following diagnostic command:
sudo changeip -checkhostname
That'll report some local configuration information and then either no errors detected and no changes required, or it'll point to whatever configuration errors or issues it might detect.  That doesn't catch everything, but it catches the common errors.
FWIW, 192.168.0.0/24 and 192.168.1.0/24 are poor choices for the local network, as VPNs are based on IP routing and IP routing gets tangled when the same subnet is used on both ends of the VPN. 192.168.0.0/24 and 192.168.1.0/24 are near ubiquitous in home networks and coffee shops.