Remote site communication failure

I have an ISA 2006 server setup as an edge server.  I have one local LAN 192.168.2.x and three remote sites with 2 workstaions each on Subnet 192.168.3.x, 192.168.4.x, and 192.168.5.x.  We are all connected via T1's using an MPLS.  The routers do all of the tranlations and all sites are as if local.  I can connect to each one of my sites via dameware or remote desktop just fine, they can not access anything in the 192.168.2.x subnet at all without using a VPN.

I have two nics on my ISA server, internal with the following settings:
IP 192.168.2.32
SM 255.255.255.0
no gateway
DNS1 is set to internal 192.168.2.36
DNS2 is set to internal 192.168.2.34
additional IP's 192.168.2.50, 192.168.2.51, 192.168.3.1, 192.168.4.1, and 192.168.5.1

External NIC settings are:
IP 27.1.88.81
SN 255.255.255.240
gw 27.1.88.71
no dns

additional IPs 17.61.171.25 and 17.61.171.5

I have the range of 192.168.2.0 - 192.168.5.255 for my internal ISA network settings.

I hope this is enough information for someone to beging helping out, I have been trying to solve this on my own for nearly a month with no success.

Thanks
Matt