Wednesday, December 14, 2011

Diablo 3 Error 3003 Fix

While Diablo 3 is loading, you may receive an error telling unable to connect to the service. If you are among those users experiencing this problem, you're at the right place to find a working solution for you.


1. Make sure all Minimum System Requirements are installed
2. Disable Window Mode
3. Change Preferred & Alternate DNS Servers
4. Download-Install Driver Updates
5. Prevent Graphics Card from Overheating
6. Repair Game Settings

Make Sure that All Minimum System Requirements are Installed

For playing Diablo 3, there are several hardware and software must be installed on your computer. If any of them are not installed, then you might experience Diablo 3 error 3003.
  • Operating System: Windows 7, Vista or XP
  • Microsoft DirectX 9 or later
  • Processor: AM Athlon 64 X2 4400+ or Intel Pentium D 2.8 GHz
  • Graphics Card: ATI Radeon X1950 Pro or NVIDIA GetForce 7800 GT
Disable Window Mode

The Window Mode refers to running a game in a window so that other applications can be seen at the same time; rather than giving the game entire full screen to use.

You might experience Diablo 3 error 3003 if the game is running in the window mode. Disable it to fix your issue. Do the steps given below to modify settings:

1. Open My Computer.
2. Open Diablo 3 installation directory, for example, C:\Program Files\Diablo 3
3. Double click the file called Diablo IID3Prefs.txt
4. There is a line "DisplayModeWindowMode" which may contain "1" value.
5. Replace that "1" with "0".
6. Click File | Save.

Change Preferred & DNS Servers

The network settings of your computer can cause Diablo 3 error 3003. In order to fix your problem, change the Preferred Server and DNS Server to the free Preferred & DNS server services provided by Google.

1. Click Start | Control Panel.
2. Click Network and Internet | Network and Sharing Center.
3. Under "Connections", click your network connection.
4. Local Area Connection Status box will open.
5. Click Properties.
6. Select "Internet Protocol Version 4 (TCP/ IPv4) and click Properties.
7. In the second section, select the option called "Use the following DNS server addresses".
8. Under "Preference DNS Server" box, type 8-8-8-8
9. Under "Alternate DNS Server" box, type 8-8-4-4
10. Click OK | Close.

Download-Install Driver Updates

Is your computer running with the older version of device drivers? Running Diablo 3 with outdated device drivers often result in Diablo 3 error 3003. The solution is to download & install latest updates.

Prevent Graphics Card from Overheating

Your graphics card may be overheating that's why Diablo 3 error 3003 problem persist. Take appropriate steps to prevent this situation and fix your problem completely.

Repair Game Settings

The recent changes made to the game settings may be the reason behind Diablo 3 error 3003. The settings are usually stored in the registry hives which needs to be repaired.

1. Download Diablo Registry Fix such as Reg in out.
2. Start a full scan.
3. Fix errors found in it.

The software Reginout is a great tool to optimize PC for gaming. It has an extreme gaming profile feature which lets your computer run fine by optimizing its services which helps to play game without any lagging or crashing. 


  1. well, none of this stuff helped out, thanks for the try tho.

  2. What song is that in the video...have been trying to find it on itunes but it's driving me crazy!

  3. The registery fix is a keylogger.


Note: Only a member of this blog may post a comment.