Locked account, help finding source

Hi

One of our users is often experiencing that his account is locked, we have attempted to locate the source of this, without luck.

Currently running a simple function in PowerShell which goes through the security log.

Function Get-LockedOutInfo ([String]$user) {

Get-EventLog -LogName Security | where-object {$_.EntryType -match "FailureAudit" -and $_.message -match $user} | Sort timegenerated | FL

}


Running the function it tells us that the failed attempts originate from our TMG server.

Filtering the log on TMG server, with only these settings:
web proxy or firewall
Client username
Last day

No failed attempts is showing, not one.
In other similar cases we have been able to see the failure attempts in the TMG log.

Does any have any tips on how follow up on this, to try to locate the source for this ?


Example from the security log:

Index              : 82577185
EntryType          : FailureAudit
InstanceId         : 4625
Message            : An account failed to log on.

                     Subject:
                         Security ID:        S-1-0-0
                         Account Name:        -
                         Account Domain:        -
                         Logon ID:        0x0

                     Logon Type:            3

                     Account For Which Logon Failed:
                         Security ID:        S-1-0-0
                         Account Name:        user.name
                         Account Domain:        domain.com

                     Failure Information:
                         Failure Reason:        %%2313
                         Status:            0xc000006d
                         Sub Status:        0xc000006a

                     Process Information:
                         Caller Process ID:    0x0
                         Caller Process Name:    -

                     Network Information:
                         Workstation Name:    TMGSERVER
                         Source Network Address:    TMG.IP
                         Source Port:        xxxx

                     Detailed Authentication Information:
                         Logon Process:        NtLmSsp
                         Authentication Package:    NTLM
                         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.
Category           : (12544)
CategoryNumber     : 12544
ReplacementStrings : {S-1-0-0, -, -, 0x0...}
Source             : Microsoft-Windows-Security-Auditing
TimeGenerated      : 30.10.2013 11:49:25
TimeWritten        : 30.10.2013 11:49:25
UserName           :