Windows Firewall vs. RRAS

Hi,

I have an old Windows Small Business Server 2003 R2, and after going through an Ipnat.sys problem, I'm now deactivate both the Windows Firewall and Routing and Remote Access Service (RRAS) on the Win SBS 2003 R2 just so the workstation computers can access the server.

Is there something I've missed on the settings? Or is this a common problem in Win SBS 2003 R2 after the RRAS has been turned on?

Thanks in advance for helping me out here.

Dhow here.