Can't Host / Join MP Coop with a Friend

[F31!x 10]

Hey there,

I'm a big fan of the Arma Series, so I bought OA in the Give & Get Sales last week on Steam. I now try to play the campaign in coop with a Friend but we can't join each others MP Game.

I enabled DMZ for my IP-Adress and also opened the following ports:

TCP 6073, TCP/UDP 2234 TCP/UDP 2300-2400 TCP 47624

I found something of this in the Forums and also through google, but nothing in the Readme for this.

My friend also opened the same Ports at his router. Now when we try to join a game someone of us hosted the Ping will be shown with a "?" or Ping of 2500.

I don't understand why. I also allowed the game to communicate through the Winodws Firewall (both Windows 7 x64). But also when I desiable the Firewall it does also show no Ping and nobody can join the Game (Connecting Failed).

So hopefully someone of you have an Idea what we do wrong?!

Thanks for your time!

[visceralsyn 10]

Take your machine off DMZ, there should never, ever be a reason to use DMZ.

Forward 2302~2305 UDP, to the static LAN IP for your machine.

To get a static LAN IP, configure your machine with an IP. You can still leave DHCP on, in your router. You don't need Winders firewall runnin if yer behind a router. It does not provide more protection, it provides an additional obstacle to get through to the in'nernet, when yer already behind a firewall, NAT.

...Syn...

[F31!x 10]

Hi VisceralSyn,

thanks for your reply, I already have a static IP route to my machine, It's not the first MP Game I play online and where I have to open Ports. All others are working even with Hosting (e.g. Company of Heroes). This is why I don't understand that Arma 2 doesn't work :(

[visceralsyn 10]

Hosting a game, also known as hosting a listen server, is not the same as playing a game. The simple act of playing a game should not require forwarding of ports.

Since you are not sure where you are to open ports, I suggest a visit to Port Forward.com.

You might also have that funky UPnP thing turned on, if you did not configure port forwarding for Company of Heroes, and it still allows you to host. I have Company of Heroes, 2 clients on the same LAN, and hadta configure port forwarding for both to be able to play and host seperate sessions.

Also note, if you have a ip in the DMZ, you cannot configure port forwarding to point to that ip. Since you had it on the DMZ, and it still gave you problems, then your next problem was the Winders firewall. Which if disabled via the control panel, is not disabled. If the Service is on, the application is on.

...Syn...

[F31!x 10]

UpNp is off, COH is forwared on the Ports that are required.

And yes I also know how to open ports. I'm no computer noob or do not understand what to do.

My simple question is which ports exactly needs to be open to play online and also Host a coop-game?

[visceralsyn 10]

2302~2305 UDP

Only needed for hosting, ports do not need to be forwarded for play.

...Syn...