How to Fix Building 21 DLC Error in Warzone 2 DMZ

By Angel Marquez | 2023-05-09 02:56:01
Check out our guide on How to Fix Building 21 DLC Error in Warzone 2 DMZ and get back to playing the game you love.

Call of Duty: Warzone 2 is an immensely popular first-person shooter game that has taken the gaming world by storm. However, players have been encountering frustrating issues that prevent them from accessing the Building 21 DLC in DMZ. This error can be extremely vexing, especially for players who have invested a lot of time and effort into the game. In this article, we will provide you with the steps to fix the Call of Duty: Warzone 2 Building 21 DLC error in DMZ.

What is DMZ?


DMZ stands for Demilitarized Zone. In computer networking, it refers to a physical or logical subnetwork that separates an internal local area network (LAN) from other untrusted networks, usually the internet. The purpose of a DMZ is to provide an additional layer of security to the internal network by placing servers and other network resources outside of the firewall.

When it comes to Call of Duty: Warzone 2, DMZ relates to the issue of the Building 21 DLC error that players encounter. The game's servers may not be able to communicate with the player's console or PC due to the DMZ settings, resulting in the error.

Other games and software that may encounter DMZ issues include virtual private networks (VPNs), peer-to-peer file sharing, and online gaming services.

Steps to Fix the Call of Duty: Warzone 2 Building 21 DLC Error in DMZ

  • Disable DMZ: The first step to resolving the Building 21 DLC error is to disable DMZ if it is enabled on your router. This can be done by accessing your router's settings and navigating to the DMZ settings. Once there, uncheck the box that enables DMZ and save your settings.
  • Clear Cache and Cookies: Clearing your console or PC's cache and cookies can help resolve the issue. This can be done by going to your browser's settings and clearing the cache and cookies. You can also try clearing the cache and cookies on your gaming console.
  • Restart Router: Sometimes, simply restarting your router can help resolve network issues. Power off your router, wait for a few minutes, and power it back on again.
  • Port Forwarding: Port forwarding can help resolve network issues that prevent your console or PC from communicating with the game's servers. To do this, you will need to access your router's settings and forward the necessary ports for Call of Duty: Warzone 2.
  • Use a VPN: Using a VPN can help bypass network restrictions and resolve the Building 21 DLC error. You can use a reputable VPN service to connect to a different server and try accessing the game.
  • Contact Technical Support: If none of the above steps work, you can contact technical support for Call of Duty: Warzone 2. They can provide you with additional support and troubleshooting steps to resolve the issue.


The Call of Duty: Warzone 2 Building 21 DLC error in DMZ can be a frustrating issue for players. However, by following the steps mentioned above, you can resolve the issue and get back to playing the game. Remember to always prioritize your online security and only make changes to your router's settings if you know what you are doing. Happy gaming!
Tags: Call of Duty, Battle royale, Warzone tips, Warzone updates, Warzone weapons, Warzone maps, Warzone strategies, Warzone l
Platform(s): Microsoft Windows PC, Xbox One, Playstation 4
Genre(s): Battle royale, first-person shooter
Developer(s): Infinity Ward
Publisher(s): Activision
Release date: March 10, 2020
Mode: Multiplayer
Age rating (PEGI): 18+
Video preview



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