#ipsec-authentication

Windows Event ID 4983 – Microsoft-Windows-Security-Auditing: IPsec Main Mode Authentication Failed

Event ID 4983 indicates an IPsec Main Mode authentication failure during VPN or secure network connection establishment. This security audit event helps identify authentication issues in IPsec communications.

Windows Event ID 4960 – Microsoft-Windows-Security-Auditing: IPsec Main Mode Authentication Failed

Event ID 4960 indicates IPsec Main Mode authentication failed during IKE negotiation. This security audit event fires when Windows cannot establish secure IPsec tunnels due to authentication issues.