When you configure URA using the wizard, it creates a Group Policy which contains settings for the IPsec policy that will be used. These settings apply to the Windows Firewall, which establishes the connection on both sides. In some situations, you might want to adjust the settings for IPsec, but that cannot be done from the URA console. To affect these, you'll have to dig deep into Group Policy.
Note
STOP!
Adjusting the IPsec settings is risky business! You could easily render your URA settings invalid, and break the service completely. If you don't keep track of your changes properly, you might have no choice but to reset the entire URA configuration and start it from scratch. Another risk is setting the options in a way that's less secure than the default ones, and thus exposing your network to an attack. Also, not all changes are supported by Microsoft, and if you ever require support, the support engineer might request that you revert...