How do I stop this message from appearing in my syslogs?

How do I stop this message from appearing in my syslogs? I am unsure
what is causing this. Any advice would be greatly appreciated. Thanks

Logon Failure: Reason:Unknown user name or bad password User
Name:IUSR_WEBPROD Domain:WEBPROD Logon Type:3 Logon Process:NtLmSsp
Authentication Package:NTLM Workstation Name:WEBPROD Caller User Name:-
Caller Domain:- Caller Logon ID:- Caller Process ID:- Transited
Services:- Source Network Address:- Source Port:-