Error code

Blizzard BLZBNTBGS000003E9

BLIZZARDBLZBNTBGS000003E9
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

A network error prevented the game from connecting to the Blizzard game server..

How to fix it

  1. Check Blizzard service status.
  2. Restart your router and computer.
  3. Run Battle.net's Scan and Repair on the game.
  4. Configure antivirus exceptions.
  5. Update drivers and operating system.
  6. Delete the Battle.net Tools folder.
  7. Uninstall and reinstall the game.

Not affiliated with Blizzard. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.