This needs to be pinned.

I'm also having problems online. I can't seem to find any rooms and even when I try to join my friend's room directly, I get the 'connection was lost' error. My friend has his ports open and I can't open mine because of my internet provider.

Mine is on by default and I still can't find matches. Opened ports, PnP on, DMZ on, and I've even disabled my firewall but still nothing.

Originally posted by Niddian:

Mine is on by default and I still can't find matches. Opened ports, PnP on, DMZ on, and I've even disabled my firewall but still nothing.

same here =/

Still can't find anything...

Same problem here. Can't find matches/rooms and no matter how many times i tried with a friend we can't connect to play against each other, always getting the "connection lost" error when any of us tries to connect to a room when we send invitations.
A bit frustrating since we were playing SIGN without any trouble at all. (and never having any serious trouble with other fighting games in general)
Tried a few solutions mentioned before like ports etc. but no luck yet. Didn't try anything with DMZ though because I read that it's not safe for PC to do this, apparently?

I was going to do a thread like this, so I'm glad to see this one pinned. Hopefully these problems will get sorted out soon!

i got better results opening the steamworks p2p ports: https://support.steampowered.com/kb_article.php?ref=8571-GLVN-8711

Originally posted by JimSam:

Didn't try anything with DMZ though because I read that it's not safe for PC to do this, apparently?

If by DMZ you mean activating the respective option in your router's settings for your PC, that's inherently unsafe from a security point of view, since it exposes that PC to any access (meaning access on any port) from the Internet. And since that PC is on the same physical LAN as all other machines/devices connected to it, once that PC is getting compromised, those other devices/machines will be compromised, too.
That's why DMZ's in corporate networks have additional firewalls between the DMZ machines and the rest of the corporate's intranet, or even (physically and/or logically) separate networks which can't access each other unless configured to do so (through NAT/port forwarding).
So I'd recommend to not utilize the DMZ option, but use port forwarding instead. That's not 100% safe either, but a lot better than the DMZ option.

Port forwarded all the relevent ports but still can't find any lobbies, or find lobbies via ID's

Originally posted by y_Sensei:

Originally posted by JimSam:

Didn't try anything with DMZ though because I read that it's not safe for PC to do this, apparently?

If by DMZ you mean activating the respective option in your router's settings for your PC, that's inherently unsafe from a security point of view, since it exposes that PC to any access (meaning access on any port) from the Internet. And since that PC is on the same physical LAN as all other machines/devices connected to it, once that PC is getting compromised, those other devices/machines will be compromised, too.
That's why DMZ's in corporate networks have additional firewalls between the DMZ machines and the rest of the corporate's intranet, or even (physically and/or logically) separate networks which can't access each other unless configured to do so (through NAT/port forwarding).
So I'd recommend to not utilize the DMZ option, but use port forwarding instead. That's not 100% safe either, but a lot better than the DMZ option.

Hm I am not aware of the technical aspects but yes this is pretty much what i mean. Thanks.

I decided only to give it a try only to see if i get a different result and like the topic creator I managed to find a room. Unfortunately I still cannot invite my friend to play.

There is definitely something wrong going on here.

Also can't find any matches/rooms. Anyone got a solution?

Originally posted by Kabaluk:

Also can't find any matches/rooms. Anyone got a solution?

It's your Internet provider problem. So do I. I am going to change once the contract is over.

Which IP should I put under "Host IP" when turning on DMZ?

Sign definitely seemed more reliable than Revelator does, so I'm not sure it can be entirely chalked up to ISPs. Hopin' this get enough attention that we see a patch

Originally posted by Seph:

Which IP should I put under "Host IP" when turning on DMZ?

Search for how to set up a static IP address - the easiest way I've found is to set it up in your router's DHCP options, but that'll depend on your equipment.