Hi Team I have been getting the following event regurally in Win Event Viewer > Security. I have checked all the services and other applications but i dint found the my username then how and why this event is generating >? kindly asssit O/S Win2003 Ent with SP2 Below event is generating every 30mins or some times every onehour Successful Network Logon: User Name: Usertest Domain: Domain-Name Logon ID: (0x0,0x4957F57B) Logon Type: 3 Logon Process: Kerberos Authentication Package: Kerberos Workstation Name: Logon GUID: {7dd19665-5204-03d0-ce66-c7a4b459f99d} Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: - Source Port: - For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Successful Network Logon: User Name: usertest Domain: Domain-Name Logon ID: (0x0,0x419E3656) Logon Type: 3 Logon Process: Authz Authentication Package: Kerberos Workstation Name: Server Name Logon GUID: - Caller User Name: Server Name$ Caller Domain: MOHE Caller Logon ID: (0x0,0x3E7) Caller Process ID: 872 Transited Services: - Source Network Address: - Source Port: - For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.Thanks