Common ProblemsI'm trying to connect to Battle.net with Diablo 1 and I can't
The GOG.com version of Diablo 1 contains two modes of play, and to be able to access Battle.net you will have to play in classic mode.
If you are playing in the original, classic mode, and are still unable to connect to Battle.net, you should first check to see if your router has ports 6112-6119 (TCP and UDP) open. If you need assistance, PortForward.com is a useful third-party site that contains port forwarding walkthroughs for most router models.
If you are still unable to connect, please try the steps in our Connection Troubleshooting article.