Error WOW51900319 in World of Warcraft: How To Fix It?

When someone mentions the MMORPG genre, World of Warcraft is probably the first game you think. This is perfectly justified given that the game is probably the most successful example of this genre. Its monthly subscription has made millions of dollars for its publishers, and almost everyone has been playing it for at least a while.

However, WoW error 51900319 is an issue that pops up randomly while playing the game. It causes big problems for players as it interrupts their gameplay, which is very important for the whole experience. Follow the methods we have prepared to try to fix the problem!

What Causes WoW Disconnected Error 51900319?

The error is mainly caused by an in-game option called “Optimize network for speed” and you should turn it off as soon as possible. Additionally, the problem tends to appear for users using NETGEAR routers with older firmware or with the Dynamic QoS option disabled.

Finally, sometimes the problem can be attributed to the IPv6 entry in the connection settings. So make sure to turn it off.

How To Fix WOW51900319 in World of Warcraft

Solution 1: Disable/Turn Off the option “Optimize network for speed”

This problematic option seems to have been the source of the error. By disabling it, she managed to stop the appearance of the problematic error code that was disconnecting users. This option is available in the game options which you can access directly in the game or on the main menu.

  1. Click on the System button on the main game menu. It will be available in one of the red rectangles.
  1. Go to the Network tab in the left navigation menu and uncheck the box next to the “Optimize network for speed” entry. Apply the changes and reopen the game. Check if WoW error 51900319 still appears while playing.

Solution 2: NETGEAR Router Issues

If you are using the NETGEAR router on the computer you are using to read WOW, you may experience this problem very often and can be caused by two factors regarding the router: old firmware or disabled dynamic QoS option. These two issues can be fixed quite easily if you follow the steps below for both scenarios.

  • Open your favorite web browser, type //, and click the Enter key on your keyboard.
  • Enter your username and password to access your NETGEAR router interface.
  • Click Administration in the Advanced section and find the Firmware Update or Router Update option. Click this option, then click Check to check for new firmware.
  • If available, it will be automatically downloaded and installed. The router will restart automatically. Check if WoW is back to normal.

If you are using a NETGEAR router, you can also enable an option called Dynamic QoS. Dynamic QoS helps improve your router’s Internet traffic management through better application and device identification, bandwidth allocation, and traffic prioritization.

  • Open your favorite web browser, type //, and click the Enter key on your keyboard.
  • Enter your username and password to access your NETGEAR router interface. The default username and password should appear in your router’s documentation or on a sticker on the side of your router. The default username and password are admin and admin.
  • Select the Dynamic QoS option from the initial screen. Check the box next to the “Enable dynamic quality of service” option. Under the Internet Bandwidth option, you can manually set the speed of your Internet connection using the second option button or you can choose the first one to let Speedtest scan it.
  • Make sure nothing is downloaded at this time and click on Speedtest. Click Apply at the top of the window to save your settings. Check if WoW error 51900319 still appears!

Solution 3: Disable IPv6 on your internet connection

Disabling this option for the Internet connection you are using can easily solve the problem. Internet Protocol version 6 is fairly new and does not support many older games. So it is better to turn it off completely as it will not affect your experience.

  • Use the Windows + R key combination which should immediately open the Run dialog where you have to type ‘ncpa.cpl’ in the bar, then click OK to open the Internet Connection Settings item in Control Panel.
  • The same process can also be done manually through Control Panel. Toggle the View by setting in the upper right section of the window to Category and click Network & Internet at the top.
  • Click the Network and Sharing Center button to open it. Try to locate the Change Adapter Settings button on the left menu and click on it.
  • When the Internet Connection window opens, double-click your active network adapter.
  • Then click on Properties and find the Internet Protocol Version 6 entry in the list. Clear the checkbox next to this entry and click OK.
  • Restart your computer to confirm the changes and see if the problem occurs during the game.

Here we present you with three best solutions to fix the WOW51900319 error of WOW. If you have exhausted all the above methods, also try these alternative solutions to fix the error.


We have provided you with the best working and tested solutions to fix the Error WOW51900319 in World of Warcraft. Hope one of these methods will definitely work for you. If you have any doubts or suggestions, feel free to comment below.

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