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no ideas how to fix this? or at least an idea what the problem is related to?

Ok now i managed to establish a connection, i had to activate DMZ in my router (it allwos bidirectional connections) strange thing, with dmz enabled i cant connect to Teamspeak, when i tur DMZ after connecting off i stay connected to the Arma host, and can reconnect to Teamspeak.

Hi, i can connect to every "green" host in the serverlist, but not to one particular host, others can join his host without problems. Ive tried to open a Dedicated server, but i still cant join him and he cant join my host. We use the same gameversion. Ive tried netsh winsock reset open Ports 2302-2350 TCP&UDP Launch Steam as Admin Launch Arma3+Steam as Admin Disable Router Firewall Disabled every Introusion Detection option i could(Router) Tried installing and using Cisco VPN (cisco mobility connect) Verify integrity of game cache(via steam) Reinstalled Battleye My Syspecs Win 7x64 EasyBox 803a Connected by cable, static network IP Win Firewall Disabled No AV software No VPN installed(removed it again) I7-920 12gb Ram Radeon 6970 Here is one Netlog ive just recorded 0.000: NetLogger: start - Mon Aug 19 22:47:08 2013 0.000: Clk(2610117) 5.802: Arma3 version: 0.76 10.147: Fac:start(1.1,2.2,'WinSock 2.0','Running',32767,65467) 43.358: Par: 1.1,65535,1400,90,3,400000,2,32000,8000,2000000,400,0,6000000,1.040,1000.0,0.980,3000000,3000000,65536 43.358: Par: 2.50,150000.0,400,15,0.1500,0.1000,0.0500,0.0200,2.20,30000.0,1.80,20000.0,1.40,10000.0,1.10,3000.0,1.40,1.20 43.358: Par: [0.900,20.0] [0.980,10.0] [1.000,0.0] [1.020,20.0] [1.100,40.0] [1.300,50.0] 43.359: Fac:cp(2316,65507,65535,8192) 43.359: Fac:cp(1,2,65527,'MSAFD Tcpip [uDP/IP]') 43.359: Ch(0):open(192.168.2.105:2316 <-> 255.255.255.255:0) 43.359: Pe(0):succ(192.168.2.105:2316) 43.360: Pe(0):list(2316) 50.958: Pe(0):cli 50.958: Cli(thecorrectip:2302#2355498565d,2302) 57.863: Ch(0):~cli 59.553: Ch(0):st(BW:250,250,0,250,250,1,0,G:3,120/0,4,-1.00,0/0,0,-1.00,30,0,Q:0/0/0,R1000.00-1000.00,8-8,91-120) 60.473: Pe(0):stopl(2316) 60.473: Pe(0):~(0,0,d18,2316,0) 60.473: Ch(0):close 60.473: Ch(0):~(0,0,0,0,0) 151.187: Fac:cp(2316,65507,65535,8192) 151.187: Fac:cp(1,2,65527,'MSAFD Tcpip [uDP/IP]') 151.188: Ch(1):open(192.168.2.105:2316 <-> 255.255.255.255:0) 151.188: Pe(1):succ(192.168.2.105:2316) 151.188: Pe(1):list(2316) 155.914: Pe(1):cli I hope someone knows whats the problem Kind Regards edit: just found out, i cant connect to every other host, just to many others;), some of them Connection failed edit2: tried to forward only the UDP ports 2302, 2303, 2305 (someone wrote somewhere it worked for him) no success:( edit3: enabled/disabled UPnP, Router and PC(dont know for what reas someone wrote it might work:-D) still Connection failed edit4: as mentione here http://forums.bistudio.com/showthread.php?161856-Multiplayer-does-not-load&p=2473960&viewfull=1#post2473960 ive removed KB2859537, nothing changed

Hi, I got the following problem, one of our members bought ArmA 2 CO on Steam. He can connect to most of the public servers. But if he tries to connect to one of our servers, no matter dedicated or not, he gets the message session lost. We tried to connect to his server, but there we get the same message as he gets when trying to connect to our servers. We already checked - Firewall - Verify integrity of game cache - Port forwarding - Starting as Admin - followed http://forums.bistudio.com/showthread.php?t=101214 its everything we could find with google... Had anybody the same problem? any ideas? kr