Getting an error when connecting to VPN “The L2TP connection attempt failed ..”

Hello AVN is Thank , 

 Thank question reaching question today . 

 error message is failed " L2TP connection attempt is failed failed security layer encountered processing error initial negotiations remote computer " typically indicates issue L2TP ( Layer 2 Tunneling Protocol ) VPN connection . error is occur occur reasons , including network configuration changes , software updates , issues VPN server . 

 troubleshooting steps is are help resolve L2TP VPN connection issue : 

 1 . * * Check VPN Server Status :* * 
    Ensure VPN server trying connect running . possible , try connecting different device issue specific Windows 11 machine . 

 2 . * * Verify VPN Server Settings :* * 
    Double - check VPN server settings , including authentication method , encryption settings , shared secret ( pre - shared key ) . Ensure settings client match server . 

 3 . * * Restart Router Modem :* * 
    , network devices is cause like routers modems cause temporary connectivity issues . Try restarting router modem resolves problem . 

 4 . * * Check Windows Firewall Security Software :* * 
    sure Windows Firewall - party security software blocking VPN connection . Temporarily disable security software try connecting . 

 5 . * * Update Network Drivers :* * 
    Ensure network adapter drivers date . Outdated incompatible network drivers is cause cause connection issues . Visit manufacturer website download install latest drivers network adapter . 

 6 . * * Check VPN Connection Settings :* * 
    Verify VPN connection settings ( including username , password , server address ) correct . small typo is lead server address incorrect authentication details lead connection failures . 

 7 . * * Try Different VPN Protocol :* * 
    VPN server supports multiple protocols , try connecting different VPN protocol ( e.g. , IKEv2 , SSTP ) resolves issue . 

 8 . * * Recreate VPN Connection :* * 
    Delete existing VPN connection Windows 11 machine create new correct settings . 

 9 . * * Check Recent Windows Updates :* * 
    mentioned installed Windows 11 received updates , it is 's worth checking newer updates available address VPN - related issues . 

 10 . * * Contact VPN Provider Support :* is consider * 
     followed troubleshooting steps connect VPN , consider reaching VPN provider support team assistance . They is have specific recommendations solutions service . 

 Remember restart Windows 11 machine making changes VPN settings network configuration . 

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