Relevant lines from my game.log:
info: GPGNET: setting nat handler to 0x113a7004
info: LOBBY: Game port 6112[UDP] opened.
info: LOBBY: starting with local uid of 62956 [Sheeo]
info: GPGNET: entering lobby state.
info: GPGNET: sending nat packet to 91.121.153.175:30351
info: GPGNET: sending nat packet to 91.121.153.175:30351
info: GPGNET: received nat packet from 91.121.153.175:30351
info: GPGNET: sending nat packet to 62.225.195.152:6112
info: GPGNET: received nat packet from 62.225.195.152:6112
info: GPGNET: received nat packet from 62.225.195.152:6112
info: GPGNET: sending nat packet to 62.225.195.152:6112
info: GPGNET: received nat packet from 62.225.195.152:6112
info: NET: using deflate compression for sends to p3EE1C398.dip0.t-ipconnect.de:6112.
info: LOBBY: rejecting unexpected connection from p3EE1C398.dip0.t-ipconnect.de:6112
info: Joingame (name=Iszh, uid=15627, address=62.225.195.152:6112)
info: LOBBY: Connecting to host "Iszh" [p3EE1C398.dip0.t-ipconnect.de:6112, uid=15627]
info: System: \000Connecting to game host...
info: NET: using deflate compression for sends to p3EE1C398.dip0.t-ipconnect.de:6112.
info: LOBBY: rejecting unexpected connection from p3EE1C398.dip0.t-ipconnect.de:6112
info: NET: using deflate compression for sends to p3EE1C398.dip0.t-ipconnect.de:6112.
info: LOBBY: rejecting unexpected connection from p3EE1C398.dip0.t-ipconnect.de:6112
...
info: NET: using deflate compression for sends to p3EE1C398.dip0.t-ipconnect.de:6112.
info: LOBBY: rejecting unexpected connection from p3EE1C398.dip0.t-ipconnect.de:6112
info: CNetTCPBuf::Read(): recv() failed: WSAEINTR
info: Run time: 0h02m17s
And from forever.log:
2014-05-17 20:21:01,440 INFO faf.client Handling game_launch via JSON {u'uid': 2204839, u'args': [u'/players 4', u'/team 3', u'/StartSpot 4', u'/UEF'], u'mapname': u'forbidden passv4', u'reason': u'ranked', u'command': u'game_launch', u'mod': u'matchmaker'}
2014-05-17 20:21:01,441 INFO faf.fa Updating FA for map: forbidden passv4
2014-05-17 20:21:01,443 INFO faf.fa Map is available.
2014-05-17 20:21:01,443 INFO faf.fa.upnp Creating UPnP port mappings...
2014-05-17 20:21:01,644 INFO faf.fa.upnp -> UDP mapping of 192.168.1.62:6112 to 95.166.62.114:6112
2014-05-17 20:21:01,650 INFO faf.fa Running FA with info: {'recorder': u'Sheeo', 'game_time': 1400350861.65, 'uid': 2204839, 'version_info': {'lobby': '0.10.115'}, 'featured_mod': u'matchmaker'}
2014-05-17 20:21:01,651 INFO faf.fa Running FA via command: "C:\ProgramData\FAForever\bin\ForgedAlliance.exe" /players 4 /team 3 /StartSpot 4 /UEF /mean 1445.87 /deviation 65.7416 /country DK /clan AIx /init init_matchmaker.lua /log "C:\ProgramData\FAForever\logs\game.log" /savereplay gpgnet://localhost/2204839/Sheeo.SCFAreplay /nobugreport /gpgnet 127.0.0.1:54312
2014-05-17 20:21:01,674 INFO faf.client FA has launched in an attached process.
2014-05-17 20:21:01,674 INFO faf.client Outgoing JSON Message: {"state": "on", "command": "fa_state"}
2014-05-17 20:21:07,456 DEBUG faf.fa.relayserver incoming connection to relay server...
2014-05-17 20:21:07,456 INFO faf.fa.relayer FA connected locally.
2014-05-17 20:21:07,502 DEBUG faf.fa.relayer faf server direct.faforever.com:8000
2014-05-17 20:21:07,502 DEBUG faf.fa.relayer Initializing ping timer
2014-05-17 20:21:07,502 INFO faf.fa.relayer Command transmitted from FA to server : {"action": "GameState", "chuncks": ["Idle"]}
2014-05-17 20:21:07,581 INFO faf.fa.relayer Command received from server : {"commands": [1, 6112, "Sheeo", 62956, 1], "key": "CreateLobby"}
2014-05-17 20:21:07,581 INFO faf.fa.relayer Setting uid : 62956
2014-05-17 20:21:07,581 INFO faf.fa.relayer Command received from server : {"commands": ["91.121.153.175:30351", "/PLAYERID 62956 Sheeo"], "key": "SendNatPacket"}
2014-05-17 20:21:07,631 INFO faf.fa.relayer Command transmitted from FA to server : {"action": "GameState", "chuncks": ["Lobby"]}
2014-05-17 20:21:07,849 INFO faf.fa.relayer Command received from server : {"commands": ["91.121.153.175:30351", "/PLAYERID 62956 Sheeo"], "key": "SendNatPacket"}
2014-05-17 20:21:07,865 INFO faf.fa.relayer Command transmitted from FA to server : {"action": "ProcessNatPacket", "chuncks": ["91.121.153.175:30351", "PACKET_RECEIVED 6112"]}
2014-05-17 20:21:08,155 INFO faf.client port used : 6112
2014-05-17 20:21:08,211 INFO faf.fa.relayer Command received from server : {"commands": ["62.225.195.152:6112", "/ASKREPLY Sheeo"], "key": "SendNatPacket"}
2014-05-17 20:21:08,233 INFO faf.fa.relayer Command transmitted from FA to server : {"action": "ProcessNatPacket", "chuncks": ["62.225.195.152:6112", "/PLAYERID 15627 Iszh"]}
2014-05-17 20:21:08,233 INFO faf.fa.relayer Command transmitted from FA to server : {"action": "ProcessNatPacket", "chuncks": ["62.225.195.152:6112", "/ASKREPLY Iszh"]}
2014-05-17 20:21:08,394 INFO faf.fa.relayer Command received from server : {"commands": ["62.225.195.152:6112", "/PLAYERID 62956 Sheeo"], "key": "SendNatPacket"}
2014-05-17 20:21:08,450 INFO faf.fa.relayer Command transmitted from FA to server : {"action": "ProcessNatPacket", "chuncks": ["62.225.195.152:6112", "/PLAYERID 15627 Iszh"]}
2014-05-17 20:21:09,707 INFO faf.fa.relayer Command received from server : {"commands": ["62.225.195.152:6112", "Iszh", 15627], "key": "JoinGame"}
2014-05-17 20:21:38,931 INFO faf.fa.relayer Command received from server : {"commands": [], "key": "ping"}
2014-05-17 20:22:10,375 INFO faf.fa.relayer Command received from server : {"commands": [], "key": "ping"}
2014-05-17 20:22:41,213 INFO faf.fa.relayer Command received from server : {"commands": [], "key": "ping"}
It seems that it didn't try to connect me to the other teams second player.
Great work btw