BM 3.7 Proxy to PIX 515

[kyndig]

I had our BM 3.7 server as the firewall with the Outside interface connected to our router. This past weekend I put a PIX 515 in between the BM server and the router. Made the Inside interface on the PIX and the Outside interface on the BM server in the same network and on a different network than our LAN network (LAN is a 10.1.x.x and made the bridging network 192.168.251.x). I also turned off Filtering on the BM server by going into Filtcfg and disabling Packet Forward Filters. I have also unloaded Filtsrv, IPflt, and IPflt31. I currently have all Internet traffic hitting the BM server for proxy purposes, then it forwards on the traffic to the PIX and it lets traffic out. Internet and email traffic are working fine but I am having a slight problem. Constant apps like a Citrix connection or other terminal services type programs are losing connection randomly. Anywhere between 5 minutes and 25 minutes the app will lose connection. I know it's not the PIX because I was using the same PIX with the same config (aside from IP address changes) and was using the same apps over it without any problems up until I put the PIX in between the BM server and the router. I believe it has to be a setting on the BM server. I have Network Address Translation disabled for both interfaces on the BM server but under Protocols, TCP/IP, at the bottom of that page I don't know if I need to disable Filter support and/or NAT implicit Filtering.

Is there anything anyone can think of that would help with this problem?

Thanks for any help.