IUSR_SERVERNAME keeps getting locked out

Hello got a issue here im been at it all morning can not figure it out, hopefully some one knows what this is and how to fix it!!
Windows server 2003 Sp1 DC

Logon Failure:
Reason: Unknown user name or bad password
User Name: IUSR_ESCDC
Domain: BLAIR
Logon Type: 8
Logon Process: Advapi
Authentication Package: Negotiate
Workstation Name: ESCDC
Caller User Name: NETWORK SERVICE
Caller Domain: NT AUTHORITY
Caller Logon ID: (0x0,0x3E4)
Caller Process ID: 252
Transited Services: -
Source Network Address: -
Source Port: -


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