Blizzard responded to the problem since the first reports and allegedly solved it, but the error is still bothering users nonetheless. In order to fix this, follow the steps below.
Why can’t I join a friend’s game in Diablo 3?
1: Update the game
We’ve written extensively on Diablo 3 issues on Windows 10. Check out these guides for more information.
2: Check the connection
Since the problem is mostly related to connection issues, try resetting your router and modem. Stick to wired connection instead of wireless. Open Ports on your router that are required for the game to work seamlessly online. For Diablo 3, you’ll need to ensure that these ports are open:TCP PORTS 80, 1119UDP PORTS 1119, 6120 Change region settings to ALL. Restore your router or modem to factory settings. Disable IPv6 and stick to IPv4 solely in network settings.
3: Reinstall the game
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