Fix World of Warcraft Error code BLZ51900001 in Windows 10

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If you are a game lover, you know the name World of Warcraft, as this game is very popular and wonderful among the games developed by the Blizzard Entertainment company. Some users are encountering the WOW Error BLZ51900001 while they are going to log in or playing this game on their Windows 10 PC. There are several facts behind this error code that can appear due to incorrect firewall configuration, a third-party antivirus software, or cache problems, etc. Doing some simple workarounds, you can fix it out. Here in this article, you will find out some very useful tips to fix error code blz51900001.

How to fix error code blz51900001?

If any error appears during playing a game or going to play a game, it bothers you a lot. Here are the workarounds and the methods to fix this error code, check these all step by step to find out the solution to this error code.

Check the Realm Status

This workaround should be done before going to any other solution to fix this error message. You can check the status of the Realm in you area by these methods:

  • Click on this link to check the status.
  • Now, check if WOW is online in your area or not by using the dropdown.
World of Warcraft

Restart your system

Restarting the system fixes many issues, and by restarting your computer system, you can fix World of Warcraft Error BLZ51900001 including other issues too. So, before moving forward, try this solution once. 

Reset the User Interface

Many users fix this error code by resetting their user interface, therefore before starting the method, uninstall any addon management software by following these steps.

  • Close the game.
  • Open Blizzard desktop app.
  • Go to the setting of the application.
  • Click on the game settings.
  • Copy the path under the- INSTALL LOCATION, which will be in the World of Warcraft section.
  • Now, open the Run Dialog box, and paste the copied path in the search bar area, and hit the Enter button.
  • Rename the folders:

            Cache- CacheOld.

            Interface- InterfaceOld.

            WTF- WTFOld.

Now, start the game. 

Reset the Console variables

If still, you are facing World of Warcraft Error BLZ51900001, then a console variable may have modified. You can reset it to fix this error message.

  • Type- /console cvar_default in the game chat box.
  • Hit the Enter from the keyboard.
  • A permission error may have noticed, but the command will still function.

Disable the installed Antivirus Software Temporarily 

If you have installed a default Windows Defender antivirus that supports Blizzard but if any third-party antivirus is installed on your computer, you may encounter the error code BLZ51900001 on your screen. So, you can fix this error by disabling the third-party antivirus software.

Go to the menu from the taskbar, and do a right-click on the antivirus icon, and then select- Disable option from the context menu.

Restore Default Settings of the Firewall

A firewall supports the game, so if you are facing this error message, then might be, there is any configuration issue with the firewall. By restoring the default setting of the firewall, you can fix this error code.

Go to the menu bar and type Firewall.cpl and hit the Enter button.

Now, click on- Restore Defaults from the Windows Defender Firewall window.

Again click on the same on the next page.

Now, restart your computer and try playing the game- World of Warcraft (WOW).


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