Initially i had quite a headache with Java software..

For one, Java drives me crazy. I kept getting all kinds of errors trying to connect to
https://unifi.ubnt.com to access my controller remotely.

Troubleshooting steps.

• Download the latest version of the controller software
  https://www.ui.com/download/unifi/

• Install the software as a service
  https://help.ubnt.com/hc/en-us/articles/205144550-UniFi-Run-the-Controller-as-a-Windows-Service

• Open required ports on your router forward to controller
  https://help.ubnt.com/hc/en-us/articles/218506997-UniFi-Ports-Used

• For your sake setup 2FA (two factor authentication)
• 
  https://help.ubnt.com/hc/en-us/articles/115012986607-How-to-Enable-Two-Factor-Authentication