how to stop hacking on my server

hi,

every time at event log on sbs2000 server i have following messages

Event Type: Success Audit
Event Source: Security
Event Category: Policy Change 
Event ID: 617
Date:  6.11.2001
Time:  3:40:29
User:  NT AUTHORITY\SYSTEM
Computer: SERVER
Description:
Kerberos Policy Changed:
 Changed By:
  User Name: SERVER$
  Domain Name: NET2000FAQ
  Logon ID: (0x0,0x3E7)
 Changes made:
 ('--' means no changes, otherwise each change is shown as:
 <ParameterName>: <new value> (<old value>))
 --
 
ISA server is configured in secure mode

I cannot found ip addres of hacker


can anyone help me?


Josef Kovar

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