There are two of us that both have battlefield 4 accounts and are on the same local network and same IP address behind a NAT. Naturally we bought the game to play together but when one of us is on a particular server, the other person cannot join that server. The game appears as if its trying to load up but eventually the BF4 exe closes and we get this error in red at the bottom of Battlelog:"ERRORGame disconnected: client closed down connection."Note, the person who was on the server first can keep playing there just fine, but the second person trying to join them can not connect and get the above error.We can also individually connect to the various servers no problem, and we can both play at the same time, as long as its not on the same server.How can this be troubleshooted. I've already been pooring through these forums and also looking up info from BF3, and have not yet been able to solve this problem.Thanks,-Nick

Ah I know what this is.Log into your router dude. The details are normally on the side of it and you just type "192.168.0.1" into your browser and it should load it up if that is your gateway.Once in your router after you've got the details, look for a section called "UPNP" go in there and turn it off.Once it is turned off, press apply/ save (Whatever the option. Give it a few seconds and try again.If not, then reboot your modem. Once it has rebooted, log back in and see if UPNP has been turned off.It must be turned off in order for 2 computers in one house to work.I know this works becuase my partner and I had the same issue and I fixed it.XP me and thanks :D

So in my case, after doing some further investigation I've managed to work around the issue. I'll try to explain a bit so that others can try a similar solution for themselves if they have the same problem.BF4's executable connects from local port 3659 to the remote server on the internet that you're trying to connect to. In my case I have a NAT router which connects my local network with 2 computers behind it to the internet connection. When computer A sends data to an internet server on port 3659, the NAT sees this, and any return data coming from the internet server back to port 3659 gets routed to computer A. When computer B sends data to that same internet server on port 3659, the NAT has already established that return data from that internet server is going to computer A, and thus computer B gets nothing back and can't connect / play.The solution for me was putting a setting back on in my router that randomizes the local ports that the data was being sent from. Ie, computer A sends data out from port 3659, the NAT intercepts it, changes it to a random port, say 30000, then sends that data out to the remote BF4 server. When that BF4 server sends data back, it sends it to port 30000, and thats routed to computer A on port 3659. Then when computer B tries to send data out to that same BF4 server on port 3659, again, the NAT changes that port to something random, say 40000, and when the BF4 server returns the data, it comes back to port 40000, and the NAT knows to send that data to computer B port 3659. By this method we're both able to connect with no problems.Again in my case, I had that local port randomization disabled in my NAT because I was troubleshooting another unrelated problem, and forgot to turn it back on.Another solution to this problem would be to simply change the local port that the BF4 executable tries to send data out on. I don't know how to do this, but it should be a simple command line argument. If you could do this, and each put your own BF4s to different local ports, you should be able to connect without having to mess with your router (if this is the problem.)Another way to get around this is to use a program called "Smart Port Forwarding" or something similar, which basically intercepts your data that your computer is sending out on port 3659, and changes that port to something else. If your two or more computers on the same local network are all using different ports, the NAT will be able to send the data out to each computer as it returns from the internet BF4 server. You should be able to search for that program, I'm not sure if I can post an external link on this forum.I hope this helps.-N

Okay.Now you've turned off UPNP in your router, the next step is...Turn off PC UPnP Service:1. Press: Windows-button (the one between lAlt and lCtrl) + R, a window should pop up.2. Write: "services.msc" (without the ") then press enter.3. In the list of services, scroll down to "UPnP Device Host", click it and press "Stop service".4. Now do the same thing but with the service "SSDP Discovery".5. Exit the window and go to control panel-> Network and Internet-> Network and Sharing Centre-> Change advanced sharing settings (to the left)-> Under "network discovery" select to turn off network discovery6. SAVE CHANGE(I cannot remember if I done this on both computers... But I know I done it. Try on one computer. If it works then great, if it does not then do it on both computers)There is also a registry edit that you can try. That is simple and easy.Here is a point towards it: http://www.battlefield4online.com/play-battlefield-3-two-more-pcs-same-network/3173/Enjoy

Okay, after hours and hours, I finally found a fix for this. 1. Disable UPnP on your router.2. Go to origin3. Right click on Battlefield 4 and select "game details".4. Next to Launch options click "edit".5. Under command line arguments, add " +clientport 2xxxx". Where "2xxxx" is a number between 20000-299996. Click "apply"6. Do the same for all of the other computers on your network, just make sure the port you enter is a different number than the other ones.7. Foward all of the computers ports you entered in origin on your router, and you're done!

Has anybody had any further luck with this?I've already tried:- Disabling UPNP in my router.- Put one of the computers in the DMZ, but that still keeps the same external IP so that doesn't work either.- Get one computer on WiFi in the hopes that the router would be smarter, but it isn't.- Disable UPNP and SSDP services on all relevant computers.- Disabled network sharing and discovery on both computers.- Edited the AppExePath registry setting for both x86 and 64bit versions of the exe to have +network.clientport27xxx behind them (different ports on all computers).Alternatively I've tried adding different ports, or changed "+network.clientport" into just "clientport" as I've read somewhere (though in less places) that I should use that.The key in question can be found inHKLM\Software\Microsoft\Widnows\CurrentVersion\GameUX\Games\"SSID for the game"I've changed both the 64 and 32 bit ports, but no difference. So I'm really hoping anyone has any idea here.Btw: Sometimes it does work, but I've been unable to find a constant factor in the behaviour.

Two people same IP cannot join same server in BF4

45 Replies

Anonymous
10 years ago
Maybe new measure against Multiboxing boosting.
(1 Physical user with 2 Pc or 2 battlefield started on the same pc, used to boost till the rank wanted)
So yeah nothing to do except to tell you friend/brother to use a vpn.
baudio
10 years ago
****** SOLUCION ******* SOLUCION ******* SOLUCION ******** INCLUYE NITRADO SERVERS
Sorry my english, iam from uruguay
hi, i have two PC in the same network, with one external ip, one router and two pc and two BF4 account .
now when one is connected, the other computer say error UDP Port 3659.

This is the fix to play with two computer in the same local area network..

1. Open Port in Router, on Port Triggering (not Port Forwarding, this is for one ip, and i have two one per computer), port
TCP: 3659, maybe 80
UDP: 3659, maybe 80

2. Donload and intall Smart Port Forwarding de http://cqt.com.uy/spf.zip [cqt.com.uy]

3. Configure in ear computer the program Smart Port Forwarding, http://cqt.com.uy/ss.jpg [cqt.com.uy]
and change IP 192.168.0.2, with local computer ip.

5. In router UPNP.. is disabled

READY ...PLAY WITH MANYS PC IN SAME LAN !!!!!!!
Anonymous
9 years ago
I found this thread because I was having the same issue with Battlefield 1. We had two people behind the same router / on the same LAN, and each could individually connect to servers, but if both tried to connect to the same one, it would fail, saying that the we were disconnected from the server.

I contacted EA, and here's what fixed it for me:

Go to your router settings or contact your ISP. Open these ports / set up port forwarding rules.

TCP: 80, 443, 5222, 9988, 17502, 20000-20100, 22990, 42127

I forwarded the ports to just one of the PCs trying to connect, it seems UPnP handles the connection for the second PC (see below).

For more information on port forwarding, see this How to Geek article: http://www.howtogeek.com/66214/how-to-forward-ports-on-your-router/

I haven't done full testing, but for what it's worth, both of my PC's have static IPs assigned by my router, and UPnP is enabled. Netgear specifically says UPnP must be enabled for two players to access the same online application.

Hope this helps someone.
iL_nono_O
7 years ago
That is not posible!
EA_Atic
DICE Team
7 years ago
I'm closing this thread to stop it being necroed.

If you have any issues with Battlefield 4 please make a new topic about the issues you are having and what kind of steps you have tried to solve it.

/Atic

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Two people same IP cannot join same server in BF4

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