For some reason, when Vigor with Firmware 3.2 , it doesn’t work well with Palo Alto PA500 , especially Yahoo. When Palo Alto make the request with cookies > 1000 characters, Vigor will not return the result. In this interesting issue, if you use WIndows , you don’t see the problems, install a Ubuntu , you can replicate the issue.
The solution is to upgrade firmware to 3.3