Hi Eblyn,
Thanks for that.
I had already used that during initial set up by adding our Backup Account which resolved for a number of servers, 2008 R2 in particular.
It's definitely not Firewall, though it was in one case but that was a new server build.
It's sporadic at best. We added a new server this morning and that installed remotely with no issues.
We're getting there.
Mondo