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Extra hop in one direction - causing session problems?

Extra hop in one direction - causing session problems?

(OP)
We have 2 networks - main (192.168.1.0/24) and sub (192.168.20.0/24) - there is a NetScreen 5GT (called INTERFW01) between the two zones (main = work, sub = untrust) and this NetScreen (192.168.1.1) acts as the default gateway for the main network.  This netscreen has a default route of 192.168.1.2 which is also a 5GT (called EXTERNALFW02).  This 5GT is then connected to the internet.

However, we're having some problems sessions to the internet being dropped on the main LAN (at least I presume that's what's happening).  Normal web page access is fine, but anything that requires a constant or lengthy connection (eg Remote Desktop, Messenger, large file download) is troublesome - downloads fail, messenger or RDP looses connection and needs to be re-initiated etc etc etc

When traffic from the main LAN goes to the internet, obvioulsy it goes to INTERFW01, then onto EXTERNALFW02 and the onto the internet and it's destination.  However, when traffic returns obviously, it comes back to EXTERNALFW02 and then onto the requesting host on the main LAN - it doesn't need to go back to INTERFW01.  And (at least in my opinion) herein lies the problem.  I've tried changing the settings on the work zone on INTERFW01 to turn off "If TCP non SYS, send RESET back" but this didn't help.

Like I said, my suspision is that this is because by the session response not coming back through the INTERFW01 - but I don't know how to tell the firewall (or which firewall even).  Obviously we've setup an any any policy from work to work on INTERFW01 but we need something else.  Can anybody help with this at all???

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