Mobile devices can't enrol after upgrading to latest 11.4.2500.28 version

Hi all

Does anyone else have this issue? When enrolling ABM managed iOS devices, the remote management page just times out as it seems it can't reach our Endpoint Central (via the secure gateway) anymore.

I noticed this started after we upgraded our product to the latest service pack 11.4.2500.28

Also all our phones/tablets that are already enrolled can't be reached anymore to clear passcodes etc and the last comms they had with the central server was just before it got taken offline to apply the service pack.

The version we upgraded from which worked was 11.4.2500.15

Has anyone else got this same issue?

I also noticed that some new options appeared in the secure gateway/NAT settings page (see attached screenshot) which I don't remember being there before but I could be wrong. Both are toggled on but I wonder if that has something to do with it?