Connection timed out on https dmz services behind reverse proxy

[Blade1]

Hi All,

I have a web-based service which is behind a Virtual IP (load balanced). The service is running on https with certificates on each server.

When I setup the reverse proxy to point to the DMZ VIP, the connection times out.

Everything in F5 (the load balancer) is green so wokring correctly
I have enabled a firewall rule for https to the VIP IP

Any ideas what the issue may be?
Also the fqdn of the service is global.domain.com but other dmz services are domain.com . In the reverse proxy I've set domain.com as the external fqdn. Does it matter if some services don't conform to this?

Thanks