DTU Access Through Firewalls - Help Please

Hi Everyone,
I'm trying to connect some DTUs between two customer sites where they have 2 FOGs configured. I hope to use AMGH eventually but at the moment I'm just testing connectivity between the sites. I'm told that the firewalls between the sites are permitting all incoming TCP and UDP traffic to each site.
To test this I have been ssh'ing from site A to site B's SR servers and can also get to the web interface of both SR servers at site B from site A. I realise this doesn't really test the UDP side of things.
So here's the problem: The DTU at site A has the GUI firmware on and I've configured it to look for the primary SR server at site B. When I switch the DTU on it correctly obtains an IP address from DHCP at site A and then proceeds to try and talk to the SR server at site B. It seems to do this correctly and the SRSS web interface at site B shows a pseudo session has been created, however, the DTU at site A sits with the OSD 26B error (waiting for x session I believe).
Apart from the firewalls being incorrectly configured is there anything else I need to do do on the SR Servers to permit the DTUs getting x sessions?
Many thanks.
Chris
Edited by: mac_chris on Dec 30, 2009 9:08 AM

UPDATE:
Following some interesting conversations with the third party looking after the network it looks like this was a firewall configuration issue. It was indeed the case that no UDP traffic was able to get from site B to site A which is why the DTUs at site A pointing at site B weren't showing a session.
DTUs at site A can now get sessions from site B so all is well.
Edited by: mac_chris on Jan 7, 2010 2:40 AM

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