Performance Point Errors with F5 & Kerberos

Security cannot be positively established by an IP-based address using HTTPS ( because of how certificates work -- you should be accessing it by hostname, like https://vpn.example.com. That's what you would add into the "Trusted Sites" security zone. To understand why these settings can be important when running what MS calls "Active Content", among other things, check out this MSDN article about security zones:

https://technet.microsoft.com/en-us/library/dd361896.aspx