Ubuntu Networking :: Traffic Restricted On Certain Machines?

first, here is our setup:

Linksys Router with firewall
1 Linux Server -- Running Dapper
Multiple Linux ThinClients running off the linux server
Multiple Freestanding Linux Machines -- Running ubuntu variants
Multiple Freestanding Windows Machines -- Running windows variants

The issue is that certain websites will not load on the freestanding linux machines, but they will load on our linux server and all the windows machines. examples: [URL].. These sites will start to load, but they never really finish and just seem to time out. I have tried changing the dns on the freestanding linux laptops to use 208.67.220.220 and this does not solve the problem.

I have checked the firewall rules and they seem pretty standard.when the linux machines are used on other networks, these websites work, so the problem seems to be related to this particular network.

When I do (freestanding linux):
Code:
traceroute acer.com -I
The trace times out at 30 hops
When I do (linux server):
Code:
traceroute acer.com -I
The trace reaches the destination at 19 hops

Both of the traceroute requests start by going through the router. So the big issue is that websites will load on our linux server and all our windows machines, but not on freestanding linux clients.