NAT negotiation failed

[FearofFucyMan]

After working for 3 days on the Ports and reconfiguring my modem, to play MTW2, with no positive results. Was getting ' Nat negotiation failed 'every time, when trying to join a game.

Then by good luck, thinking of old STW times, where u had to change a file within the program, I found that in ' medieval2.preference.CFG ' under [network]
use_ip= ........ was blank.
I than put in my ip address. Now I am able to join games and Host games with no problem.

So if you have problems with 'Nat negotiation failed' and put in all the ports, check the medieval2.prefence.CFG file. if it is blank put in your own ip Address.
It might solve the problem.

[Ghost of Rom]

I was getting the nat translation error quite often until I installed a router that was equipped with nat. Have not seen the error since.

[caravel]

The Windows Firewall/ICS service is also a NAT router. You should disable this entirely if you're using a hardware based NAT router, as this will cause negotiation problems.

[Shadow]

So did anyone work out a solution to this problem? Cause i am experiencing this myself

[Stig]

The proper solution would be going to the cfg file and putting in the IP adress of the server in the open slot. But no-one knows this IP.

[Shadow]

so that means there is not solution to the problem?

[Stig]

Correct, and that sucks

[Sun of Chersonesos]

I use a modem so I don't get these router issues with opening ports thank god. But every so often I don't see any games in the lobby so I have to relog or NAT negotiation issues, but it's always with one particular game. For example I join one game and I have NAT negotiation, I join another game and it works, I leave that game and join the game that first said NAT negotiation and NAT happens again.

IMO, one more thing for the wishlist for 1.3 is that CA give some port numbers. I figure that a lot more people will be seen in the lobby.

Sun

PS ; @ Stig and Shadow: Is that what Puzz3D was talking about earlier? is the port number the IP address that's put into the slot? I doubt it because to open ports on the router you need to put in numbers and these numbers correspond with whatever port you wish to open; to which the CA haven't provided any resources. On the other hand there's the IP of the server so actually I think the server IP and the port number needs to be specified by the CA in the next patch.

[Kronos]

You're probably going to have to open certain ports on the router, but as usual CA hasn't provided the port numbers.

Yes they have:

27750 (Medieval II - Total War)
* 6667 (IRC)
* 3783 (Voice Chat Port)
* 27900 (Master Server UDP Heartbeat)
* 28900 (Master Server List Request)
* 29900 (GP Connection Manager)
* 29901 (GP Search Manager)
* 13139 (Custom UDP Pings)
* 6515 (Dplay UDP)
* 6500 (Query Port)

A clan mate of mine is having the same issues when trying to connect to me, however can play perfectly fine with alot of other people. I think it might be because I have a router as well, although i've had no problems with it.

[Hunter KIng George]

I also have no router just a modem and I've had this problem for some time now...I have opened all the ports, turned off all firewalls, reinstalled game, patches , AOL, tried setting up different gamespy accounts, almost everything that has been mentioned. I've had the "NAT FAILED" problem since the patch came out. I used to play MTW2 before with no problem and now I can't. I still can log in but I cannot join or host in any reindeer games. While I was messing around with the computer trying to figure out solutions, I also somehow made mtw/vi also stop working in a similar way...I can also log in but I cannot see any games or no one can see my hosted games. The only way I can play VI is but loggin in thru 56k dialup (so embarrasing). I believe both issues are related and something is blocking for both games to function properly...

I hope the Mizu guys don't see this, they may not let me join any games on Sam Wars Sunday. Who wants to play w/someone on 56k...Gah!

[Denali]

Does anybody know which are the trigger ports and which the public ports?

I assume its both UDP and TCP?

[Sun of Chersonesos]

Hello everybody, just to try help out.

NAT means= Network Adress Translation

NAT is uses to avoid the problem with IP adress over internet, since on internet are to many people, is imposible to every one on internet have a valid IP adress. That is why some one invented NAT.

With that you can share 1 Valid IP adress(WAN IP) with many LAN IP adress, wich mean for example in a company with 120 computers that need internet, you will not need 120 WAN IP ADDRES, only 1 WAN IP ADDRESS and it is shared across all the corporation.

this is a example or NAT

IP Adress on Home Public IP Adress or WAN IP
or Corporation

192.168.1.1 - 192.168.1.254 ----> 200.44.32.12

All the computers internal have the IP 192.168.1.1 tru 192.168.1.254, but any one of this computers to access internet will use 200.44.32.12.

This process is called NAT, that is use by Routers, and Proxy Servers.

If you are having this issue and you dont have a router it could be a problem with your ISP, or with the user that is hosting the game (who maybe have a router), in the worse of cases could be GameSpy who have a CRAPY SERVER with crapy NAT resolution and his ports are geting full.

Remember with nat you share a Valid Ip internet Adress, and also all the ports, is something like this:

IP Adress on Home PORT Public IP Adress or WAN IP
or Corporation

192.168.1.1 : 8080 -------------> 200.44.32.12:8080
192.168.1.20: 27740 ------------> 200.44.32.12:27740
192.168.1.40: 27740 ------------> 200.44.32.12:27740
192.168.1.50: 27740 ------------> 200.44.32.12:27740
192.168.1.60: 27740 ------------> 200.44.32.12:27740

In this case check out that 3 computers are using the same port 27740 (MTW) if the routers is a crap router the users will get conections errors
since the routers cant handle to many users sharing same port number.

this could hapend from Gamespy side, or from your side.

Hope this help to understand better the NAT Error.

Bye bye

I think that this post has been very helpful to everyone. I don't have a router, I have a modem which means it doesn't occur so much for me unless the person on the other side has a truly corrupt and invalid source as I specified more clearly above.

Could someone please explain the situation regarding my question above which prefixes "PS ; @Stig & Shadow." Thanks