Firewall
			 
			 
			
		
		
		
			
			I have a LinkSys Cable/DSL router with 8-port switch. I put my linux box into DMZ and the other machines on my LAN can connect to the internet through NAT. I can play several internet games from this windows machine without trouble, so my guess is it isn't the router. 
 
Before I got the hardware router (which was about a month ago), my linux box was acting as software router. Had the same problem then. 
 
Just out of curiousity I installed FFXP at work. Live Update works fine there, even though the router there is more restrictive. 
 
The only ports my router is blocking are 137-139, but those are used solely by the NetBios protocol. 
 
I'll try and figure out where things go wrong by skimming through my proxy logs. Maybe that'll clear things up.
		 
		
		
		
		
		
		
		
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