Battle.Net Error 3003 Fix

When you log-in to Diablo with a Wifi or iMac connection, you might receive error 3003. It can happen due to several reasons including incorrect game configurations to problems establishing network connections.

• Disable Secondary Log-On Service
• Change Catalyst Control Panel Settings
• Scan Registry Settings
• Disable 3GB Switch
• Enable DisableTrilinearFiltering Setting
• Disable Firewall & Antivirus
• Change Display Setting

Disable Secondary Log-On Service

A computer with Secondary Log On Service disabled can show this error. Battle.Net error 3003 fix is to enable this service as given under:

1. Click Start, select Run. Type Services.msc and press ENTER.
2. Right click Secondary Log-On Service. Select Properties.
3. Select Startup Type => Automatic.
4. Click OK button.

Change Catalyst Control Panel Settings

If you are experiencing Battle.Net error 3003 with AMD Graphics Card then change its 3D Graphics Settings as shown below:

1. Right click your desktop, select Properties.
2. Click Catalyst Control Panel link.
3. Click Graphics Settings | 3D | More Settings.
4. If the following box is already checked then uncheck it. However if it is already unchecked then check it:
5. Support DXT Texture Formats
6. Click Apply | Apply.

Scan Registry Settings

Diablo can show error if some of its settings can’t be retrieved from its registry entries.  Scan all registry hives using a good registry cleaner software and fix all errors found.

Disable 3GB Switch

Using Command Prompt disable the 3GB Swtich as Battle.Net error 3003 fix. Here’s how:

1. Click Start, point to All Programs | Accessories.
2. Right click Command Prompt.
3. Select Run as Administrator.
4. Type the following command and press ENTER: Bcdedit /deletevalue IncreaseUserVa
5. Restart the computer for the changes to take effects.

Enable DisableTrilinearFiltering Setting

You can make changes to the game settings as I have shown below:

1. Open My Computer, double click the drive where Diablo is installed. For example: C:\ drive.
2. Press F3 to go with Search feature. Type d3Prefs.txt and press ENTER.
3. Press Ctrl + F. Search for DisableTrilinearFiltering. Change its value from 0 to 1.
4. Click File | Save.

Disable Firewall & Antivirus

A network connection could not be made to Battle.net servers due to your antivirus or firewall rules. Battle.Net error 3003 fix is to disable both of them and run it again.

1. Click Start, type Windows Firewall with Advanced Security.
2. Press ENTER.
3. Right click it from the right side panel, select Properties.
4. Make Firewall Status as Off.
5. Click Apply | OK.
6. Now right click your antivirus icon in the notification area, select Disable | Disable until next reboot.

Change Display Setting

Change your monitor settings so that it will show smaller text rather than medium sized text. Open Display settings:

1. Right click your desktop, select Personalize.
2. Click Display under See Also category at the left hand side on the bottom of your screen.
3. Select Smaller option, click Apply and then close the window.

 Download Battle.Net Error 3003 Fix Here