If players are not able to join your game, you may have a firewall in place. Firewalls may prevent incoming networks from reaching your computer and prevent you from hosting games.
A firewall can come in many forms. In households, they may exist as security software, router and/or modem. The following information will help you configure your firewall.
Ports
Ports can be thought of as points of connection. The game listens to these ports to receive all of the information it needs to function. You will need the following ports opened to allow your game to accept connections and to host games:
Diablo and Warcraft II Battle.net Edition:
Allow port 6112-6119 TCP and UDP out and in
Diablo II:
Allow port 6112 TCP out and allow established sessions in
Allow port 4000 TCP out (realm games)
Allow port 4000 TCP out and in (hosting open games only)
StarCraft:
Allow port 6112 TCP and UDP out and in
Warcraft III:
Allow port 6112 TCP out and allow established sessions in
Allow port 6112 TCP in (hosting custom games)
Allow port 6113-6119 TCP out and in (hosting custom games if you have changed the default port in the Options/Gameplay screen)
You may recognize names such as Norton Internet Security, McAfee Personal Firewall Plus/Express, ZoneAlarm, Sygate, Panda, and many others. These security programs act as firewalls that can block single programs or specific ports from the network. Here are some links to popular software firewalls that may help you:
Virtually all routers available today have firewall functions to protect users from outside access. In addition to this, DSL and Cable modems may have firewall functions as well. These links will give you information on how to configure your products. For port numbers and information, please see above.
Notes and exceptions There are a few things to make note of.
Warcraft III is the only Blizzard Title that currently supports multiple players hosting games behind NAT. Other games are not able to do this.
You may experience high latency with StarCraft, Warcraft II, and Diablo when joining the same game from the same connection. These games were not designed to use a shared connection.
If you have recently patched a game and get "Unable to connect", a software firewall may be blocking the game change. Please configure it to allow the changed game.
A "universal rule" for a hardware firewall may work for all Blizzard Battle.net games. Forward ports 4000 TCP and 6112-6119 TCP/UDP to your computer.
For the Blizzard Downloader, if you have bittorrent set up already just allow port 6112 TCP and 3724 TCP.
Port Triggering may work better for you depending on your router. Note that port triggering may fail if there is a second computer playing on the same game/port.
Common issues If you did not change your networking equipment and you suddenly are not able to host, your internal IP address may have changed. Check your router's Port Forward section and make sure it is still forwarding information to the right computer.
[ Post edited by Davidhc ]
Davidhc
Blizzard Poster
2. Firewalls and hosting games 10/06/2008 12:51:15 PM PDT
I recently started playing Starcraft Broodwar on Battle.net. I hosted a few games and won but the wins never showed in my profile. Are there certain specifications a game must meet to count? (i.e. not money maps, certain number of human players etc.) Please help!!
Sixen
USWest
4. Re: Firewalls and hosting games 02/10/2010 01:08:11 PM PST
Since last few days I was getting disconnects from 70% of the games but battle.net connection was fine. Recently my brother changed MTU setting from my router (D-Link 502T) to 1452. Which probably was the reason I was getting frequent disconnects.
I restored factory settings so that MTU default value is 1400 now. I have played about 10 games and it didn't disconnect from any games.
Also I changed my network cards MTU to 1500 with TCPOptimizer(optimal settings). I am not sure changing either router or LAN MTU setting did the trick. This can be added to user tips maybe?
Sixen
USWest
6. Re: Firewalls and hosting games 05/06/2010 07:33:01 PM PDT
I have a problem with hosting,I have successfully port forward 6112 - 6119 however when i host games, my games would not display on the custom game list. Only my friends who typed in the game name could join my game. can anyone help me please?
I know you get lots of people with hosting problems... I'm aware of what needs to be done and how to do it becasue i have hosted many times over the years. At the moment i have a netgear rangemax duo wndr3300 N-wireless router directly connected to my modem which is linked to my laptop. I went to the router settings site and i believe i opened the ports 6112-6119 as instructed. I have no active firewalls i am aware of but still i cannot host...
im i able to do some sort of cmd, or task manager test to see if i have something on my computer blocking?
The steps to forward the ports on this router are extremely simple i wonder if im missing something... is it possible there some sort of router unlock i have to do first before i forward or something?
Not sure what there is left to be done...
Sixen
USWest
9. Re: Firewalls and hosting games 06/08/2010 01:15:56 PM PDT
