Hello,
As far as defining whitelisted / blocked URL's to a specific VLAN in Group Policy.... does this only effect traffic on TCP 80 and TCP 443? For example, if I have a specific L3 firewall rule for "Allow VLAN10 to 199.192.199.192 on TCP 45200" but I also have a Group Policy applied to VLAN10 that has Blocked URL Patterns with an "*" so effectively blocking all patterns, and only Whitelisting a few that are necessary, will to traffic from VLAN10 to 199.192.199.192 still work on TCP 45200 because L3 rule is there?
I should mention that in my L3 firewall I have an implicit deny rule above the default allow all rule. Above that implicit deny I am allowing VLAN10 to Any on 80,443,8080, but I then use the Group Policy to restrict web traffic to only permitted URLs.