FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Mohammed_Feroz
Article Id 366136
Description This article describes how to find the failed login attempts to firewall login and SSL VPN login.
Scope FortiGate.
Solution

Reviewing failed login attempts is critical in safeguarding the device's security posture. This helps the organization identify brute-force attacks to avoid account lockouts.

Repeated login failures may signal an attacker scanning the system for vulnerabilities which is an early Indicator of Threats

 

Login failures can also be seen in system event logs and VPN event logs but the below option gives us a consolidated view of failed login attempts on both firewall login and SSL VPN login focused on login failures.

Navigate to Dashboard -> Top Failed Authentication to view the below 

 

authfailed2.png

 

Admin Login details:

 

admin.png

 

VPN login details:

 

vpn.png

Related articles:

Troubleshooting Tip: Reason for failed Admin login on FortiGate or an unsuccessful login on FortiGat...Technical Tip: How to check failed admin logins from the GUI and CLI