Two people same IP cannot join same server in BF4

No, our external IP is the same, ie the IP computers on the internet see us on is the same. Our local IPs on our local network are different.

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

I've seen the UPNP suggestion from some BF3 posts, and I've tried it.

Actually, UPNP was already disabled on my router. Further, we've tried disablingthe Windows 7 UPNP service, which also didn't work. I've also tried fully enabling UPNP on the router and in Windows, and it doesn't work.

So either way, UPNP on, off, etc, didn't make a difference and we were still not able to join.

Thanks for the suggestion though.

have you tried putting one on the DMZ?

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 discovery
6. 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

And where is the fix for that EA /Dice because we have the problem with the Sever PAtch R4 and R5. We never had this problems in the past. Only failures and no solution support = fail.

Hubby and I cant play together either... AND to top it off, we cant access our own router we have to contact the cable company to get a lvl 3 tech to do things

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