Hi,
I have issues with gmail on some workstations saying that there is no web connection or can't send email. Meantime google chat works fine. This happens sometimes like it was some king of flood protection in Zentyal (we are using gmail on number of workstations simultaniously). I have no firewall rule that blocks outbound 443, I even added special rule to allow to connect from LAN to any destination on Http and HTTPs (on top of stanrdard any/any/any in internal networks). I do not use http proxy.
I have some dropped TCP packets from IP 172.217.16.5 (that's google's if I'm right) to local gateway, source port 443, destination 64429 but is that it? Correting me if I'm wrong but adding a rule allowing all trafic from 443 is not a good idea?