Environment
 Novell ZENworks Configuration Management 2017
  
Situation
With latest iOS 10.3 release, although the root certificate of the server is installed during enrollment, the server certificate is not being trusted.
Profile Installation Failed
The server certificate for https://server.com:443 is invalid.
Resolution
Workaround:
During enrollment, after installing root certificate user has to enable full trust for root certificate on iOS device.
Go to Settings -> General -> About -> Certificate Trust Settings 
Turn on full trust for root certificate that is installed as part of enrollment.
Turn on full trust for root certificate that is installed as part of enrollment.