Vanguard Error VAN 84 is a connection error that appears when launching League of Legends or when the client tries to connect to Riot’s servers. The issue is related to Riot Vanguard, Riot Games’ anti-cheat system, which verifies that the game is running in a secure environment.

“An unexpected error with Vanguard has occurred and the client will  now close.”

This means the game client failed to maintain a stable connection with Riot’s servers or with the Vanguard service running on your computer.

The good news is that Vanguard Error VAN 84 is usually easy to fix. In most cases, restarting the client or fixing a small network issue resolves it. This guide explains the causes of the error and the best solutions to fix it.

What is Vanguard Error VAN 84?

Vanguard Error VAN 84 occurs when the Riot Client cannot properly communicate with Riot’s servers during login or game launch.

• Unstable Internet Connection
• Riot Client Session Errors
• Riot Server Problems
• Vanguard Service Not Running
• Network Configuration Issue

You can also see it on PS.

Because Riot Vanguard runs in the background and checks the game, any disruption in this verification process can trigger the VAN 84 error.

How to Fix Vanguard Error VAN 84 fast

Here are your options to fix Vanguard Error VAN 84.

1. Restart the Riot Client

Restarting the client is the simplest and most common solution:

1. Close League of Legends
2. Open Task Manager
3. End these processes:
   • Riot Client
   • LeagueClient
4. Launch the Riot Client again

This refreshes the connection to Riot’s servers and resolves many session errors.

2. Restart your computer

A full system restart resets the Vanguard service and clears temporary network problems:

1. Close the Riot Client
2. Restart your computer
3. Open League of Legends again

3. Check your Internet connection

Because VAN 84 is a connection error, make sure your network is stable.

Try the following:

• Restart your router
• Use a wired Ethernet connection instead of Wi-Fi
• Disable VPN software
• Close other bandwidth-heavy programs

A stable connection helps the client communicate properly with Riot servers.

4. Restart the Vanguard Service

If the Vanguard service stopped running, restarting it may solve the problem:

• Press Windows + R
• Type services.msc
• Find vgc
• Right-click it
• Click Start or Restart

After restarting the service, launch League of Legends again.