Fixing the Connection Problem in Diablo 3

If you are having problems connecting to Diablo III, or find yourself disconnecting frequently, please follow the steps below to troubleshoot the issue.


Check the Server Status

Before doing more advanced troubleshooting, you should first ensure that the Diablo III server is not simply down for necessary maintenance. The Breaking News section of the Diablo III login screen is typically the easiest location to find out whether the server is down or not. An alternative location is the Diablo III Technical Forums, which usually sees a rush of new posts when a major server outage occurs.

Power Cycle the Modem and Router

A remarkable number of issues can be caused by "jams" within the network cache. Simply resetting the connection to your ISP by powercycling your modem and router can resolve these.

1. Shut down all computers connected to the modem and router.
2. Unplug the router from its power source.
3. Unplug the modem from its power source.
4. Allow both to sit unplugged for a minute or two.
5. Plug the modem back in and wait until the lights on the front are blinking in their usual solid pattern.
6. Plug the router back in.
7. Turn your computer(s) back on.

Note: Modems with battery backups will need to have their batteries pulled or the reset button on the modem used instead.


Reconfigure Firewall and Router Settings

If you are using a firewall or router, you may need to manually set up your system to allow access to the game server. Your firewall and/or router will need to allow unrestricted communications on ports 80, 1119, and 6881 - 6999.

Update your Operating System

An outdated verison of Windows or Mac OS X can cause many issues. Thankfully, they're easy to update.

- Windows updates are available from Microsoft.
- Mac OS X updates can be obtained by clicking on the Apple icon and choosing Software Update

Update Your Network Hardware

Old firmware on your modem and router along with old drivers on your network card can cause issues when your network needs to deal with complex game connections. The manufacturer's website for your hardware should have firmware/driver downloads available, as well as instructions on how to apply firmware updates.


Resolve Conflicts with Security Programs and Other Third-Party Programs

Any program on your computer which monitors or uses your Internet connection has the potential to be interfering with Diablo III. Security programs may mistake Diablo III network traffic as being malicious and shut it down, and other Internet reliant software such as chat and download programs (torrents) may end up fighting over the same bandwidth and network ports.

Try closing background applications and see if Diablo III becomes stable. Be advised that most security software will continue to run in a limited manner even when turned off and may require full uninstallation to truly troubleshoot. When in doubt, contact the manufacturer of your security programs for assistance in configuring them to not interfere with Diablo III.