SMB credentials and Administrator lockouts

I am running scans on a primarily Windows 2000/2003 subnet using my own 
credentials (NOT Administrator) as provided in the SMB login section of the 
client(both GTK and NessusWX).  Despite having supplied credentials, I am 
continuously locking out all Administrator(local and Domain) accounts on all 
the devices I target.  We restrict users to 5 failed password attempts 
before locking out the account per domain policy.

After doing some additional digging via Windows Event Logs and tcpdump, it 
is apparent that nessus is attempting to do an authentication using the name 
'administrator' despite the supplied SMB credentials.  It appears (from 
event logs) that nessus attempts 'administrator, nessus..random_number, 
supplied SMB credentials.

Below is output from the event log of a targeted system in chronological 
order:

Logon Failure:
        Reason:         Unknown user name or bad password
        User Name:      administrator

Logon Failure:
        Reason:         Unknown user name or bad password
        User Name:      nessus48095321612101650981206322540

Successful Network Logon:
        User Name:      SMBlogin
        Domain:         SMBDomain

Why is this, can I turn it off, anyone else run into this?

My Admins are NOT happy with me!


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