VAN 0: Vanguard couldn't verify your PC was ready

Connection Error: VALORANT has encountered a connection error. Please relaunch the client to reconnect. Error Code: VAN 0

Zero doesn't mean "no error"

In a lot of software a zero code means success, which makes this one confusing when it's sitting in a popup that just ended your session. For Vanguard it's a real failure. Riot's reading is that Vanguard either failed to confirm your PC could run the game or tripped over something during its own startup.

Start with Windows Update

Most Vanguard fix lists open with a restart. This one opens with Windows Update, and Riot's reason is that those updates carry security and system service changes Vanguard depends on. If you've been postponing updates, that's the first thing to clear. Keep going until Windows says there's nothing left, restarting as it asks.

After that, the list moves through the vgc service, a Vanguard reinstall, a clean boot and a game reinstall, with the network checklist last. VAN 0 shares that exact order with five other codes, listed below the steps. Riot last updated the VAN 0 article on July 17, 2026, the same day as VAN 84 and VAN 2266 from its group.

Riot's fix, in Riot's order

1. Install every pending Windows update

   Open Settings, then Windows Update, and keep installing and restarting until it says you're up to date. Vanguard's checks lean on security components that ship in those updates, and optional driver updates are worth a look while you're there.

2. Set the vgc service to Automatic

   Vanguard has two parts: a driver that loads at boot and a Windows service called vgc. If the service isn't running when you press Play, the game closes.

   1. Press Win+R, type services.msc and press Enter.
   2. Find vgc in the list and double-click it.
   3. Set Startup type to Automatic. If the status says Stopped, click Start.
   4. Apply, OK, then restart the PC.

   The exception is Vanguard Pre-Check, Riot's opt-in mode where Vanguard only runs while a game is open. It needs Windows 11 25H2 or newer plus Secure Boot, TPM 2.0, IOMMU, VBS and HVCI, and if you're on it you shouldn't force the service to Automatic.

   Riot's guide: Set the vgc service to Automatic

3. Uninstall Vanguard, restart, and let the game reinstall it

   1. Close the game and exit the Riot Client from the system tray.
   2. Right-click the red Vanguard icon in the tray, choose Advanced, then Uninstall Vanguard. If the icon isn't there, search Windows for Add or remove programs and uninstall Riot Vanguard from the list.
   3. Restart the PC. Vanguard is gone if its tray icon doesn't come back.
   4. Open the Riot Client and launch the game. It reinstalls Vanguard and will ask for one more restart before Play unlocks.

   Riot's guide: Uninstall Vanguard, restart, and let the game reinstall it

4. Do a clean boot

   This switches off every non-Microsoft service for one boot, so you can tell whether something in the background is the problem.

   1. Press Win+R, type msconfig and press Enter.
   2. On the Services tab, tick Hide all Microsoft services first (skip it and you'll switch off parts of Windows).
   3. Click Disable all, then tick vgc again so Vanguard still starts.
   4. Apply, OK, restart, and test.

   Some programs ignore a clean boot anyway, third-party antivirus and networking tools most of all. If the error goes away, turn services back on a few at a time until it returns, and you've found it.

   Riot's guide: Do a clean boot

5. Reinstall the game

   Uninstall from Windows' Installed apps list with the Riot Client closed. For a clean reinstall of League, Riot also has you delete the Riot Client folder under C:\Riot Games, the Riot Games folders under %localappdata% and %programdata%, and the League of Legends folder in Documents. That last one holds your replays, so copy them out first if you want them.

   Riot's guide: Reinstall the game

6. Work through Riot's connection checklist

   Last on Riot's list for a reason: only get here once the Vanguard steps above have failed. Riot's PC connection guide covers the usual suspects: a wired connection instead of Wi-Fi, restarting the router, switching to a public DNS, firewall exceptions for the Riot Client and game, and turning off VPNs.

   Riot's guide: Work through Riot's connection checklist

Related errors

• VAN 6
• VAN 84
• VAN 133
• VAN 135
• VAN 2266
• VAN -1

Source: Riot Games Player Support, Error VAN 0, updated July 17, 2026. Riot's steps are paraphrased here, not copied; checked September 25, 2026.