Policy Change Event: 621

Event ID 621 – System Security Access Granted

Event 621 is logged whenever logon rights are granted. The logon right can be of any type, such as "Access this computer from the network"or "Logon as a service". These rights are defined in the group policy objects, and applied by the computer, and thus, the "User Name" field gives the name of the same computer, instead of the name of the user who granted the right.

Note: This event is logged only when logon rights are granted; it is not triggered for other category rights.

This log data provides the following information:

• Access Granted
• Account Modified
• Assigned By
• User Name
• Domain
• Logon ID

Why does event ID 621 need to be monitored?

• To ensure logon rights are restricted for certain accounts and users
• To monitor activities performed by the SYSTEM account
• To monitor activities of high value accounts
• To detect anomalies and malicious activities
• To ensure non-active accounts and external accounts are not used
• To ensure only authorized and whitelisted accounts grant permissions
• To look out for the activities carried out by restricted computers

Pro Tip:

ADAudit Plus helps you avoid the GPOs monitoring complexities with real-time pre-configured reports and auditing of the changes along with alerts within a Domain & OU. The advanced Group Policy settings real-time audit reports highlight the elusive change details, and also provide the old and new values of the modified attributes.