Fix: Battle.net Error Code BLZBNTBGS000003EA (Connection Failed Issue)

BLZBNTBGS000003EA is a connection-related error that occurs when the Battle.net client fails to authenticate with Blizzard’s servers during login or gameplay. This typically results from interference caused by antivirus programs, blocked network ports, or unstable local network configurations.

Additional factors like corrupted DNS records, VPN interference, or a damaged Battle.net installation can also disrupt the client’s ability to establish a secure handshake. Since this issue originates from your local environment, it can usually be resolved by adjusting your security settings, refreshing your network configuration, or repairing the Battle.net client.

Follow the steps below in sequence to identify and resolve the source of the error.

1. Uninstall or Disable Antivirus (Temporarily)

Antivirus software can mistakenly flag Battle.net files as malicious, causing connection failures and triggering this error. Temporarily disabling your antivirus helps determine if it’s the cause.

1. Right-click the antivirus icon in your system tray (bottom-right corner of the screen).
2. Select Disable protection, Turn off antivirus, or Pause protection.
3. Launch the Battle.net app and check if the error still occurs.

If the problem is resolved after disabling the antivirus, you should whitelist the game in your antivirus settings by following these steps:

1. Press Win + S, type Windows Security, and press Enter.
2. Click on Firewall & network protection.
3. Select Allow an app through firewall.
4. Click Change settings, then choose Allow another app…
5. Navigate to C:\Program Files (x86)\Battle.net\ and add Battle.net Launcher.exe.
6. Also add the executable file for the game you’re trying to play (for example, Overwatch.exe or ModernWarfare.exe).
7. Ensure that both Private and Public checkboxes are selected for each entry.
8. Click OK and restart the Battle.net client.

2. Flush DNS / Reset Network Settings

If your DNS records or network configuration are outdated or corrupted, it can prevent the Battle.net client from connecting properly. Flushing your DNS and resetting your network stack will clear any problematic entries.

Steps to Flush DNS:

1. Press Windows + S, type cmd, right-click Command Prompt, and select Run as administrator.
2. Enter the following commands one by one, pressing Enter after each:

   ipconfig /flushdns ipconfig /release ipconfig /renew

   

Steps to Reset Network Settings:

1. Press Windows + S, type Network Reset, and hit Enter.
2. In the Network Reset window, click Reset now.
3. Click Yes to confirm. Your system will restart automatically.

If the error persists after completing the steps above, reinstalling the Battle.net client may be necessary. A clean installation removes corrupted files and restores all default configurations, helping the client reconnect to Blizzard’s servers without issues.