So first, hello everybody, I'm happy to have someone who is interested to help me.

I purchased ARMA III last Monday, 23.06.14 on Steam.I played ARMA II before and I think this game is really great. But now I've got a "little" problem with the Multiplayer.

Everytime I try to play on a BattleEye protectet server, I am losing connection and getting the message "BattleEye: Client not responding" after 5 - 10 minutes and I'm getting kicked out of the game. No matter if I'm trying this with Mods or not. I have already looked at these threads: 0005956 0005127 but they can't help me.

My troubleshooting so far:

-I tried to start the game without Mods
-I let Steam search for gamefaults
-I searched in Google for about six hours
-I've updated the BEserver.dll and the BEclient.dll from the original BE website (In both directions (Installfolder and AppData\Local\Arma 3))
-I opened the ports on my router

-I tried it with the FritzBox 3390 at home
-I tried it with the Speedport W501V at home
-I tried it with the Speedport W303V at friends' (With his Computer there are no issues with any router!)
-Local Network Gaming is working fine!

-I updated my WLAN driver (Qualcomm Killer Wireless-N 1202 (2,4GHZ and 5GHZ))
-I updated my Graphics driver (NVidia GeForce 680M 4GB to Version 337.88)

I don't know what I should do next to handle with this...
Do you have any ideas?

Greetings,

Yomyo

EDIT:
Sorry forgot this:

-I closed Kaspersky Internet Security
-I addet game and BEService.exe to Windows Firewall
-I updated router Firmware