I have a Windows 2008 R2 domain, DC01 is the domain controller that holds the FMSO roles and FP01 is an ADC.
On FP01 I am getting event ID 4625 logged in the security log at least once a second. However I do not get this error on DC01. The event is:
An account failed to log on.
Security ID: SYSTEM
Account Name: FP01$
Account Domain: INTERNALDOMAINNAME
Logon ID: 0x3e7
Logon Type: 8
Account For Which Logon Failed:
Security ID: NULL SID
Account Name: Administrator
Failure Reason: Unknown user name or bad password.
Sub Status: 0xc000006a
Caller Process ID: 0x4a8
Caller Process Name: C:\Windows\System32\svchost.exe
Workstation Name: FP01
Source Network Address: -
Source Port: -
Detailed Authentication Information:
Logon Process: Advapi
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Transited Services: -
Package Name (NTLM only): -
Key Length: 0
This event is generated when a logon request fails. It is generated on the computer where access was attempted.
The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.
The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).
The Process Information fields indicate which account and process on the system requested the logon.
The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.
The authentication information fields provide detailed information about this specific logon request.
- Transited services indicate which intermediate services have participated in this logon request.
- Package name indicates which sub-protocol was used among the NTLM protocols.
- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
Is this a genuine security breach? If not is there a way I can stop these events being logged? That said I don't want to mask a problem by hiding the veents if they are relevant.