Hi Guys

Ive recently come accross a problem when upgrading our 2820 router to the latest version. It was/is running one of the very early firmware revisions.
Anyway i noticed that it was out of date so installed the latest 3.3 version, thats were my problems began...!

We use the second subnet option to pass through a bunch of public IP addresses to a DMZ which has a few servers hosting various low bandwidth applications.

After upgrading i am having major connectivity issues with devices on this subnet. I am able to remotly connect to services running on these servers from the WAN side, for example I can connect to a web app and a remote desktop session. But i cannot get web access to the WAN from any of the DMZ servers when initialised from the DMZ side.

So for example, I can SSH into one of my ubuntu servers, but when i then try to run apt-get update to get thelkatest package lists, it will not connect. This is the same if i try an ftp session or an ssh session back out. I can however ping remote servers from the DMZ side which is very odd.
Before anyone asks, DNS lookups appear to be working, so I can ping google.com or bbc.co.uk. but if i then try and perform an HTTP session to either of these it just doesnt work.

In the end I had to downgrade my firmware back to one of the very early revisions again.

Id be grateful if anyone can shed some light on this?