I am currently running M4600 Appliance with OS 12.5. I have been getting complaints with multiple users getting ERR_TIMEOUT errors when attempting to access:
The page will ultimately display after a couple of minutes. The users traverse a HTTP-proxy with Application Control, Geo Location IPS, APT Blocker, IPS, AV and Web Blocker enabled. If I log off and then log onto my testing account which traverses a HTTP packet filter the page displays with no delay.