Here you can find some infos about ports and port forwarding, also how to check your connection.
To make sure nothing is blocking DoW2 in case you got connection problems, disable your software firewall and any antivirus software. Forward the necessary ports on your router, infos below.
What ports does GFWL need?
Forwarding these ports should work:
Also make sure you have uPnP on your router enabled.
More infos can be found here.
What ports does Steam need?
- UDP 27000 to 27015 inclusive (Game client traffic)
- UDP 27015 to 27030 inclusive (Typically Matchmaking and HLTV)
- TCP 27020 to 27050 inclusive (Steam downloads)
How do I forward ports on my router?
Check your router's manual or the manufacturer's website for infos.
For a detailed description you can go to portforward.com and find your router, then choose "XBox Live 360" to see how to forward the ports for GFWL.
How can I check my connection and ports?
In DoW2 bring up the GFWL menu (press "home") and find the "network information" in the settings. There check if your NAT-type is "Open" and if uPnP is enabled.
Check your connection with the Internet Connectivity Evaluation Tool for possible problems and solutions. Note that it only can be run with InternetExplorer.
Get the PortChecker from portforward.com for testing your ports.
Set your network connection's MTU to 1500
This was reported by several user to fix there connection issues, have a look here to see how it's done.