How to fix blz51900001 Error (World of Warcraft) WORKS 100%


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Numerous users have been confronted with the blz51900001 message. In this article, we will try to explore some possible solution to this issue.

You can fix the blz51900001 error in World of Warcraft with any of these 3 methods. Continue reading to find out how.

If you experience problems with World of Warcraft after patching, first check the Realm Status page to see if your realm is currently online. If your realm is online, try the following:

Method 1: Reset your user interface
  1. Completely exit World of Warcraft.
  2. Uninstall any addon managers to make sure they don't re-add your removed addons.
  3. In the Blizzard desktop application, click Options and select Show in Explorer (Windows®) or Reveal in Finder (Mac®).
  4. Open the World of Warcraft® folder.
  5. Rename the Cache, Interface, and WTF folders to CacheOld, InterfaceOld, and WTFOld.
  6. Re-launch World of Warcraft so the changes can take effect.
If you use Windows and still encounter issues, follow the below steps to delete specific files in the Virtual Store directory.

Method 2: Reset your Network (for Windows 10)

After troubleshooting your system without success, try to reset your network. To do this, go to Windows Setting by pressing the Windows+i button on the keyboard, or clicking Start and then Settings button. This will take you to the Windows Settings screen, then click “Network & Internet.”

1. On the “Network & Internet” screen, click the "Status" tab on the left. Scroll down and click the "Network Reset" link on the right-hand side.

2. The "Network Reset" page shows a warning about the consequence of resetting your network, and also tells you a restart is required after the reset. Reset the network by clicking the "Reset now" button, and then reboot the system.

3. When the prompt to confirm network reset is displayed, click "Yes."

4. And that's all! After your system has rebooted, Windows will guide you through your network setup.

Method 3: Flushing Domain Name Server(DNS).

You need to open an administrative command prompt windows. In Windows 8 and windows 10, to do so, Press Win+C in combination to bring up the ‘Charms bar’. In its search box, type cmd. Then, right-click on it and choose ‘Run as administrator’ option. Alternatively, you can also open an elevated command prompt from the WinX menu.

Next, type the following and hit enter:

ipconfig /flushdns

You should be able to see a confirmation dialog window:

Windows IP Configuration. Successfully flushed the DNS Resolver Cache.

That is it, Now close command prompt window and try to Login again. This time, you should be able to log in seamlessly without blz51900001 error.

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