Cannot Host Co-Op Game

[her001]

When I try to host a co-op game on Linux, the person joining (from a windows machine) gets a non-responsive game, and I see a message saying that my partner has disconnected.

[nroach44]

Have you tried the other way around?

I know that hosting a PS3 player works.

[her001]

I was able to join the other person's game without any issues (besides latency, due to his internet).

[johndrinkwater]

FWIW, connected to another linux users’ game fine; also connected to same user with portal2 ps3. Maybe just Win→Linux ?

[flamingspaz]

Can confirm when I host on Linux my friend on Windows gets put back into the menu with no buttons. The other way around works.

See http://steamcommunity.com/sharedfiles/filedetails/?id=232185805

[SleepyAkubi]

Can confirm.

[josefnpat]

+1 subscribing

[SuperTux88]

I have the same problem (Linux <-> Linux)

When the other person hosts the game, I see this in my console: Connecting to public(192.168.2.38:27015) ... 446.735: Sending Steam connect to 192.168.2.38:27015 1100001002cd60a Initiate 1100001002cd60a Generated 0.0.0.1:1 for 1100001002cd60a Created NS_CLIENT connection to 1100001002cd60a Retrying public(192.168.2.38:27015) ...

192.168.2.38 is his LAN address, but we are not in the same LAN.

When I host the game, his game tries to connect to 127.0.1.1

It worked a few weeks ago.

[bndbsh]

Still an issue.

[LiamDawe]

Confirming this is an issue still years later.

Linux to Linux doesn't even work most of the time.

[VAlex0]

@LiamDawe @mninja @SuperTux88 @josefnpat @SleepyAkubi @flamingspaz @johndrinkwater @her001

Hey guys. Im glad i can help here. I had the same problem today with a friend of mine and could fix it.

tl;dr: Use the ingame console to manually choose the friends ip

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My setup: Win 8.1 64 bit, WLAN Card, Asus Router, Portal 2 Steam version, the update from March 5 in 2018 (Today is 8th of April 2018) I personally forwarded port 27015 UDP&TCP onto my PC, but i did not check yet if that is necessary

My friends setup: Win 7 Pro 64bit, LAN Card, FritzBox Router, Same steam version of the game

As it seems, the setup has no effect and there is a high chance that your setup can be fixxed too!

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The problem: Portal 2 is gathering a wrong public ip. It is either the loopback (127.0.0.1) which happened on my system, or your own PC in your LAN, e.g. 192.168.1.42. This information is then sent to the other player via the steam game connect system.

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The fix:

• Manually connect to the host
• Manually start the coop map

For these commands you need to open the ingame console. Enable it in settings -> keyboard/mouse -> Enable console Then you can use the console (default is key ```)

1. The friend now needs to type into the console connect 10.11.12.13 (=public ip of the host https://www.whatismyip.com/de/)
2. A little bit after that the host can initiate the coop map by typing in map map mp_coop_lobby_2 This will create a coop game that starts in the lobby. Important: The friend will try to recconect every 5 seconds for the end of the time. But the host will only load the map, and after 10 secs kick the host, because no other player joined! So best is to first connect the friend and then start the map

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Problem: cheats are turned on, so no achivements. To solve that type in sv_cheats 0 and restart Portal 2 and the coop game (source: https://steamcommunity.com/app/620/discussions/0/846962626973701432/?ctp=2#c353915309344599851)

All map names in the right order: The correct order of maps thanks to: Kpok

"mp_coop_start" 
"mp_coop_lobby_2" 
"mp_coop_doors" 
"mp_coop_race_2" 
"mp_coop_laser_2" 
"mp_coop_rat_maze" 
"mp_coop_laser_crusher" 
"mp_coop_teambts" 
"mp_coop_fling_3" 
"mp_coop_infinifling_train" 
"mp_coop_come_along" 
"mp_coop_fling_1" 
"mp_coop_catapult_1" 
"mp_coop_multifling_1" 
"mp_coop_fling_crushers" 
"mp_coop_fan" 
"mp_coop_wall_intro" 
"mp_coop_wall_2" 
"mp_coop_catapult_wall_intro" 
"mp_coop_wall_block" 
"mp_coop_catapult_2" 
"mp_coop_turret_walls" 
"mp_coop_turret_ball" 
"mp_coop_wall_5" 
"mp_coop_tbeam_redirect" 
"mp_coop_tbeam_drill" 
"mp_coop_tbeam_catch_grind_1" 
"mp_coop_tbeam_laser_1" 
"mp_coop_tbeam_polarity" 
"mp_coop_tbeam_polarity2" 
"mp_coop_tbeam_polarity3" 
"mp_coop_tbeam_maze" 
"mp_coop_tbeam_end" 
"mp_coop_paint_come_along" 
"mp_coop_paint_redirect" 
"mp_coop_paint_bridge" 
"mp_coop_paint_walljumps" 
"mp_coop_paint_speed_fling" 
"mp_coop_paint_red_racer" 
"mp_coop_paint_speed_catch" 
"mp_coop_paint_longjump_intro" 
"mp_coop_credits"

[bigbeno37]

Bit of a necropost, but I just wanted to mention I came here from Google and I resolved the issue by disconnecting my Tailscale VPN.

[ooliver1]

@davidw-valve this is still an issue, it is reporting 127.0.1.1 as my public ip on linux but works perfectly fine with the suggested manual stuff with port forwarding