From Hearthstone, Heroes of the Storm, Overwatch, Diablo, and StarCraft, as well as various Call of Duty games, they were all experiencing lagging and a decreased in performance.
For some users, the issue stopped them from starting the Battle.net launcher entirely, while others who were playing Blizzard games at encountered different connection problems, including being kicked out of the game.
Some couldn't even sign in to the online based game platform because of this.
According to Blizzard Entertainment, the reason Battle.net' issues was because the platform was under attack by a Distributed Denial of Service (DDoS).
The company notified users about this on Twitter, as well as on Battle.net's desktop or PC client that showed a prompt entitled "Breaking News."
We're currently investigating an issue affecting our authentication servers, which may result in failed or slow login attempts. #BlizzCS
— Blizzard CS - The Americas (@BlizzardCS) November 24, 2021
[#BNet] We are currently experiencing a DDoS attack, which may result in high latency and disconnections for some players. We are actively working to mitigate this issue.
— Blizzard CS - The Americas (@BlizzardCS) November 24, 2021
The outage was verified by DownDetector, which reported that a number of Activision Blizzard's properties were experiencing spikes in outages, with thousands reporting that Battle.net was down.
The outage however, didn't affect all players.
On social media networks as well as on other platforms, only hundreds of people complained about losing service.
This suggested that the issue was not a full outage, and that the "high latency and disconnections" likely didn’t affect the majority of players.
Some users who were still able to log in to the accounts, were redirected to a notice that reads: "It's a busy day for Battle.net!"
The DDoS campaign lasted about an hour, before the issue was addressed.
A DDoS attack happens when an individual or group of individuals overwhelm a server with requests for traffic, crippling its ability to send and receive data.
In this case, Blizzard's servers were flooded with fake traffic.
That overwhelmed its servers, preventing a number of legitimate users from signing in.
Previously, Blizzard had experienced numerous DDoS attacks on their servers over the years, including high-profile attacks on WoW: Classic shortly after its release.
The DDOS attacks that we were monitoring have ended. If you are still unable to log in try https://t.co/XSV7UVlWlu
— Blizzard CS - The Americas (@BlizzardCS) November 25, 2021