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Error codeLeague of LegendsWindows 11 PC
League of Legends error VAN 9003
Secure Boot is turned off
VAN 9003 means Secure Boot is not turned on, and this version of Vanguard needs it before you can play.
Fix it
How to fix error VAN 9003
Turn on Secure Boot in your PC's BIOS or UEFI settings.
Use Riot's Secure Boot instructions, which cover the different setups PCs can have.
From League of Legends's help pages: support.riotgames.com, in our words. Checked on 11 November 2026. If the steps do not help, League of Legends's own support is the next stop.
More
More League of Legends errors and common problems
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- Attempting to reconnectConnection drops during a match
- Lag and low FPSWeak hardware, heavy settings or old drivers
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- Error code 004Patch failed to download or install
- VAN 68Vanguard lost its connection or session
- VAN 57Riot Vanguard is not running
- VAN -81Vanguard trouble starting or staying connected
- Unexpected error with the login sessionAnother client copy stuck in the background
- VAN 1067Vanguard hit an error checking your system
- VAN 0Vanguard couldn't verify your PC
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