Hosting for steam/gog crossplay doesnt work without UPNP

[UbergamR]

Hosting for steam/gog crossplay doesnt work without UPNP. Im using GOG, I tryed to open 27016 and 42805 and 42852-42872 range. My friend couldnt connect. Then i tryed opening everything from 0-65535. My friend couldnt connect. Then i enabled UPNP on my router, after that i could host a game where my friend could connect in. But now i played without him so im higher lvl than he so if i host he cant really do anything. Hes playing from steam. So he tries to host, i couldnt connect. He opened 27016 and 42805 and 42852-42872 range, i couldnt connect. Then he opened everything from 2000-65535, i couldnt connect. His router doesnt support UPNP at all so we really couldnt solve this problem and now i cant really play with him. We OFC disabled every other firewalls and antiviruses and everything that could possibly prevent the server. We even tried the 32 bit clients running in admin mode but i still couldnt connect. Please help!

[Zantai]

UPNP is going to be the most straightforward solution for the average user, yes.

We can’t speak to the specific setup of your friend and can’t really provide assistance there, but port forwarding is necessary for Steam and GOG to play together, in this case:
42805
42852-42872 (all ports in this range)

[UbergamR]

Did you read what i wrote? He has no UPNP and we did try to open those ports…

[Zantai]

I did read what you wrote and I’m sorry he’s having issues, but we can’t provide insight into how to address your friend’s network setup.

[UbergamR]

So i have an issue with your game and you cant help to solve it?

[Gnomish_Inquisition]

slight tangent maybe,
but did you guys try like a hamachi style pseudo lan?
sometimes people have had success with that when they couldn’t use the automated system/regular steam connection

[UbergamR]

Unfortunately hamachi didnt work either, I really dont understand how that is possible. Like the basic problem, i dont understand whats the difference between opening all the required ports and enabling UPNP since opening the ports didnt work ONLY upnp on my side.
When i check my router running the game it says UPNP is opening the ports: 42805, 42852 and 42855. But when we manually open those it just doesnt work.
It very much seems like that hosting (for crossplay at least, but for sure) depends on some unknown function of the UPNP and without it it just doesnt work, which is dumb

[Gnomish_Inquisition]

not a networks guy, so can’t tell you how stuff works, other than it can be pretty complicated, and as i understand sometimes it can even be ISP related

@UbergamR

42852 and 42855

i did catch this, tho, did you only open those 2 ports?
because Zantai said to open all from xxx52-72

42852-42872 (all ports in this range)

so that would mean you’re missing opening a lot of ports if so ?

[UbergamR]

@UbergamR

42852-42872

If you read my original post, i mentioned there that we did try and open 42852-42872 and also tried opening EVERYTHING from 2000-65535

[HmaKvla]

sorry for hijacking this thread, but how can people join my games?

the router, that connects to the internet, doesn’t have upnp and can’t manual port forward. and i’m behind a second router that is firewalled pretty hard…
and people can join my game oO makes no sense to me…^^ you sure this isn’t voodoo or GD has steam play? xD

[UbergamR]

i honestly don’t know

[UbergamR]

It has been 5 days since i didnt get any meaningful help from the creators

[medea_fleecestealer]

Grim Dawn - Common Issues and Solutions

Common Multiplayer Issues and Solutions UPnP This is a technology that allows an application (like Grim Dawn) to communicate with your router. If your router supports UPnP (most do), Grim Dawn can tell your router to allow other people to connect to your computer when you are hosting a game. Why is this needed? Routers by default are designed to BLOCK anyone connecting to your computer. This is a security thing. You don’t want random/malicious computers connecting to your computer unless you …

Though I’m confused whether they can or can’t join your games. If they can’t see if anything in that link helps. If they can, what’s the problem?

[medea_fleecestealer]

If your friend doesn’t have any UPNP at all then I don’t think it’s possible to multiplay the game.

[Gnomish_Inquisition]

@UbergamR

didnt get any meaningful help from the creators

thing is, the dev can’t really help, even if they want to, Zantai already explained it, it’s network issue, but they have 0 way of know how your friend’s network is set up

We can’t speak to the specific setup of your friend

we can’t provide insight into how to address your friend’s network setup

they would have to know what’s going on with your friend’s network, which is probably tantamount to needing Crate to be on location at your friend’s house to gauge how their connection is strung together,
and since you don’t have a little “pocket zantai” to bring to your friend’s house, it’s more limited with what help can be provided when they don’t know the inner workings of what’s going on on your friend’s end

you can try and see if this “trick” works for you/your friend, another person did some investigating into their router when they had a connectivity issue and discovered this solution:

@Regda

I actually found the bug that prevented me to host, and also an workaround.
So, at first 2 points that might be important:

1. Some routers (like mine) might have a global option that enables/disables the sending of upnp statusinformations to the devices (that means it might receive upnp but does not tell the applications on a device what has been done or hows the status).
2. Related to Windows Firewall, either you have also to open the upnp port and be sure that grimdawn (as application rule, not port rule) is not denied ingoing and outgoing, or you just enter a application rule for grimdawn instead of port rules. (i did that with the ports)

To shorten the following, the bug is that the game does not connect if upnp is not identified by the game as “working”, no matter if the ports are already opened and/or upnp is disabled ingame.
The following 5 scenarios demonstrate this:

Scenario 1:

1. The Ports 27016, 42805, 42852-42872 for TCP/UDP are open on the router and the firewall, on site of the host.
   UPnP on the router is disabled.
   UPnP in GrimDawn is disabled.
2. Start grimdawn x64

Expected:
Grim dawn crossplay works via “internet” and “lan”.

Actually:
Grim dawn crossplay does not work (“lost connection” while joining)

Scenario 2:

1. The Ports 27016, 42805, 42852-42872 for TCP/UDP are open on the router and the firewall, on site of the host.
   UPnP on the router is disabled.
   UPnP in GrimDawn is disabled.
2. Start grimdawn x64
3. Click on Options ? Network ? Enable UPnP
4. Click on “test” button

Expected:
Public ip reported by router is “invalid”. (actually i would expect that it tells me to restart the game)
Grim dawn crossplay works via “internet” and “lan”.

Actually:
Public ip reported by router is “invalid”.
Grim dawn crossplay does not work (“lost connection” while joining)

Scenario 3:

1. The Ports 27016, 42805, 42852-42872 for TCP/UDP are open on the router and the firewall, on site of the host.
   UPnP on the router is disabled.
   UPnP in GrimDawn is enabled.
2. Start grimdawn x64
3. Click on “test” button

Expected:
Public ip reported by router is “invalid”. (actually i would expect that it tells me that no information have been received via upnp)
Grim dawn crossplay works via “internet” and “lan”.

Actually:
Public ip reported by router is “255.255.255.255”.
Grim dawn crossplay does not work (“lost connection” while joining)

Scenario 4:

1. The Ports 27016, 42805, 42852-42872 for TCP/UDP are open on the router and the firewall, on site of the host.
   UPnP on the router is enabled.
   (so in my case “enabled” means the router does not update the ports by UPnP but is sending the statusinformation which ports are open)
   UPnP in GrimDawn is enabled.
2. Start grimdawn x64
3. Click on “test” button

Expected:
Public ip reported by router is “213.209.82.66”.
Grim dawn crossplay works via “internet” and “lan”.

Actually:
Public ip reported by router is “213.209.82.66”.
Grim dawn crossplay works via “internet” and “lan”.

Scenario 5:

1. The Ports 27016, 42805, 42852-42872 for TCP/UDP are open on the router and the firewall, on site of the host.
   UPnP on the router is enabled.
   (so in my case “enabled” means the router does not update the ports by UPnP but is sending the statusinformation which ports are open)
   UPnP in GrimDawn is enabled.
2. Start grimdawn x64
3. Click on “test” button
4. Disable UPnP on the router. (so ofc minimize game, not close)
5. Click on “test” button

Expected:
Public ip reported by router is “255.255.255.255”. (based on the previous scenarios, but i would expect that it tells me that no information have been received via upnp)
Grim dawn crossplay works via “internet” and “lan”.

Actually:
Public ip reported by router is “213.209.82.66”.
Grim dawn crossplay works via “internet” and “lan”.

So what i dont understand is why the game tests UPnP instead of sending some bytes through the ports that have to be open and waits for an answer.
The other thing i dont understand is why the game (crossplay or whatever) just does not connect if UPnP is disabled in the game. I checked which ports have been opened by UPnP using the routers log files, which just opens 42805 by start of the server and a port >42852 everytime a player tries to join. So it should not even matter if UPnP is enabled or disabled ingame or on the router if the ports are already open…

[UbergamR]

After many trying we managed to find a working solution which is using “Radmin VPN” as a free hamachi like software and with it, i could finally join my friends server. But this issue is pretty serious i think

[system]

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