Unable to Join or Create Custom Games

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 or joining games.

Check out the information provided and give these a try before creating a new topic!

Ports & Firewall Information

Common Issue
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.

Support Articles

If these resources do not help, please try the steps on our Connection Troubleshooting article.

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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)

  • Blizzard Downloader

    Allow port 6881-6999 TCP and UDP out and in
    Allow port 3724 TCP out and in
    Allow port 6112 TCP out and in

For assistance configuring your router or firewall, contact your ISP or hardware manufacturer. Portforward.com is a third party website that contains portforwarding guides for most router models as well.

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