This excludes the Windows Defender as that does not take the Vanguard service as harmful. Third-Party Antivirus - Another probable cause of the issue in question could be the antivirus software that you have on your system.In such a scenario, we’ll have to simply allow Vanguard and the Valorant game through the Windows Firewall. This happens when the incoming or outgoing requests received or sent by the Vanguard service are blocked by the Windows Defender Firewall as a precautionary step to keep your system clean. Windows Defender Firewall - First, one of the main reasons this error message might get triggered is due to the Windows Defender Firewall.However, keep in mind that the reasons are not limited to the ones listed below, but rather they are just a part of it. Nonetheless, before we get into the solutions to this issue, let us understand the potential causes of the issue in question. Thus, it can pretty easily trigger a false positive on your system especially if you have third-party antivirus software installed on your system that helps keep your computer clean.

Anti-cheat software works by scanning your system for any sorts of hacks or any other malicious files that might put the integrity of the game at risk. As a result, the anti-cheat software is not able to start properly.

The error message in question indicates that some process on your system is interfering with it.

Vanguard Anti-cheat has Encountered an Error However, since Vanguard is required to keep the game integrity of competitive gameplay, the game won’t start when the anti-cheat software is not running properly in the background. Whenever you launch the game, Vanguard is launched automatically in the background. The “ Vanguard Anti-cheat has encountered an error” error message appears when you are trying to open up the game.

Install valorant vanguard