How To Port Forward (made for myself)

1. Disable any VPN or Proxy or something

If this is enabled, it won't work.

2. Allow the application within the Firewall

Usually, whenever you activate the network on a new application, windows asks you to add it to the list, and has preselected one of the options. Just leave it on this option and accept.

If things don't work out, then maybe something went wrong here. Allow both private and public networks. The reason I say this is because I've tried to get something to work for hours, and this right here was the problem.

3. Figure out which port a game uses

You can either google it, or (with the game running and hosting a server) use Resource Monitor ( included within Windows Vista / Later ), and go to Network tab, Listening ports, and the process / port(s) should show up.

4. Forwarding the port(s) on the router / modem page

Figure out how to get to your router page, and then forward the ports there.

It will be on something that starts with 192.168. For me it's on:

Make sure that the local IP (192.168.x.x) of your computer is correct within the port forwarding settings.
You can find it through cmd ipconfig, scroll up and on the line that says:
IPv4 Address. . . . . . . . . . . : 192.168.x.x

Also make sure that any enabled check is checked on

5. Disabling IPV6

For some reason, for me, I had to disable IPV6 in order to get UDP working. TCP worked fine with IPV6, but UPD apparently doesn't for whatever reason.

But then later, I reenabled IPV6, and things still worked, so IDK.

6. Testing if things work

Start hosting your game, and at the same time go to https://www.yougetsignal.com/tools/open-ports/ and check if each port is open (TCP only, UDP is not supported here).

If any 1 of the ports is open, things will most likely work.

If you want to scan UDP, consider using nmap ( https://nmap.org/ ). See below on how to use it.

7. The game might work now, but if not

Consider opening windows defender firewall with advanced security , And then whitelisting the application / ports manually there.

Or try to remove the applications within firewall, and then starting them back up again

8. Also consider your routers Firewall

Findable on your modem/router page

I've set it so that it allows most things, except for some other things.

9. Disable DMZ if enabled

10. Try Disabling or enabling UPnP

11. Port overlap

It might be the case that a different program is already using a specific port, so you may need to find that program, and stop it, or if the game allows it, use a different port number.

12. When hosting a game through LAN only

check if the other person isn't on a different WIFI network which is seperated from your main WIFI network.

13. How to use nmap for UDP and TCP

Note that this tool might get stuck on "Starting Nmap ..." for a long time.

Also note that the second time you run a scan after the first one is finished, it might give a different result if the first one wasn't very descriptive.

When I have an UT99 server running (newest patch as of 2025), the output of nmap (for port 7777) is:
7777/udp open unreal Unreal Tournament 2004 game server

1. Install nmap
2. Start Nmap - Zenmap GUI
3. Into command, type the following syntax:
4. nmap -sU -sV -p <port(s)> <target>
   The target being your remote IP (you can find this by searching for: what's my IP?) Within the ports field, you can either type 1 value, or a range like 7777-7779, or comma seperated, or a combination of everything.
5. For TCP, it's the same thing, only -sU becomes -sS, so the full syntax becomes
   nmap -sS -sV -p <port(s)> <target>

14. Port list for some games

Specifics

UT99

First of all, there are unofficial patches ( see https://ut99.org/ ) , which you need to download in order to see the list of servers.

And then during hosting, there is a server.log file, which told me that these old servers don't existed yet anymore. So I had to update UnrealTournament.ini in order to copy the newer server lists from Default.ini

Jazz Jackrabbit 2

So there is a patch available, called jj2+ (see https://www.jazz2online.com/jcf/showthread.php?t=19489 ).
This is different from Jazz² Resurrection (thought that might work as well, I haven't messed with it).

Anyways, If you use GOG Galaxy, make sure that instead of manually downloading it (which does work for letting a friend try it out), you change the config to use the JJ2+ mod, which by default it does not. And so if you locally install the JJ2+ mod, GOG galaxy will be like: Oh, hey, the version you've just installed is not the same version according to your settings, and thus it will revert it instantly back to the regular (worse) version.

You can do this by clicking on the settings icon right of play button -> Manage Installation -> Configure -> under installation: set Beta channels to JJ2+ Mod.

Game ideas

Look at co-optimus.com https://www.co-optimus.com/system/13/classic.html# (specific link, but you can search however you want). Filter, System PC, online co-op, add co-op campaign if you want, click it, find games. Single click on release date to sort from oldest to newest, then scroll through all of the TBD pages, like page 17 or something, and then you see things in a good way.