Reset your UTM-1 appliance to factory defaults using the Reset button as detailed in Resetting the UTM-1 Appliance to Defaults.
You can adjust the time on the Setup page's Tools tab. For information, see Setting the Time on the Appliance.
Look at the Event Log page. If it lists blocked attacks, do the following:
For instructions, see Defining an Exposed Host.
When you have finished using the application, make sure to clear the exposed host setting, otherwise your security might be compromised.
Disable any pop-up blockers for http://my.firewall.