Unable to join Wifi Enterprise Network after the latest update.

Since the last update wifi network settings changed. While joining any Enterprise Network I simply used to select Do not Validate under 'Root CA certificate' now I have install the certificate the 'Do not Validate' option is no longer available. Don't what to do I'm unable to join my on my university wifi network. Although if I select 'Use System Certificate' still can't connect because Domain name field can't leave empty.