Thank you for your reply,

I am aware of everything you have mentioned, i have many Horizon installations, with such same architecture.

We have validated everything 10x times from top to bottom, including firewall, no drops are seen.

Gateways are disabled from View server as they are being now used in UAG, this is the first instant thing i am doing right away.

As i mentioned, internal users are also going through UAG and it works.

Means something is wrong with F5 but cant know where to point this. F5 vendor obviously is pointing the problem and blame Horizon...