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Disabled Domain Computer Accounts

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Subject Author Date
Disabled Domain Computer Accounts Tim Nichols 09-20-2006
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Posted by Roger Abell [MVP] on September 21, 2006, 10:21 am
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Tim,

I thought about your situation last night for a while, but did not
see a usable solution for you.
If the machines of concern have not been updating their passwords,
they would not likely be doing so in the future - hence attempt to
see failure events when they do is not your solution (besides how
long it would take).
If there are machines in the situation you are considering, they are
already logged into the domain, and hence they are running on the
Kerberos tickets from then. When they renew it is not a new login
so you would not be catching login failure events. You could at
least in theory enable Kerberos detail logging, but the amount that
would be generated would probably make doing this not helpful.

etc.

My final feeling was that you may just have to wait, as the login
failures for abcdefg$ accounts would eventually show up, after
those machines are rebooted.

Roger
> We are currently trying to remove old computer accounts from our Active
> Directory domain. We used a third party utility to find all of the
> computer accounts on the domain that did not have their password changed
> in 90 days or more. We then disabled all of these accounts.
>
> What I am curious about is whether there is an event that will be recorded
> in our domain controller security logs for any computers that have been
> disabled, but may still be logged on (for example, if a user doesn't log
> off at the end of the day but instead locks their workstation, they may be
> able to unlock it the next day and keep working, in fact this is true
> because we have tested it). We want to make sure no one is actually using
> a computer that had their account locked out.
>
> So, if we could search our event logs for a specific Event ID pertaining
> to the computer being locked out, we could figure out if some of the
> accounts we disabled are actually online and just hadn't updated the
> computer account password in the normal 30 days for XP and 2000 desktops.
>
> -Tim Nichols
> MCP
>



Posted by Steven L Umbach on September 22, 2006, 1:03 pm
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With that advice he could attempt to force a reboot of the computers using
something like PsShutdown using a text file with the fully qualified names
of the computers assuming they are connected to the domain network with the
proper network connectivity.

Steve


> Tim,
>
> I thought about your situation last night for a while, but did not
> see a usable solution for you.
> If the machines of concern have not been updating their passwords,
> they would not likely be doing so in the future - hence attempt to
> see failure events when they do is not your solution (besides how
> long it would take).
> If there are machines in the situation you are considering, they are
> already logged into the domain, and hence they are running on the
> Kerberos tickets from then. When they renew it is not a new login
> so you would not be catching login failure events. You could at
> least in theory enable Kerberos detail logging, but the amount that
> would be generated would probably make doing this not helpful.
>
> etc.
>
> My final feeling was that you may just have to wait, as the login
> failures for abcdefg$ accounts would eventually show up, after
> those machines are rebooted.
>
> Roger
>> We are currently trying to remove old computer accounts from our Active
>> Directory domain. We used a third party utility to find all of the
>> computer accounts on the domain that did not have their password changed
>> in 90 days or more. We then disabled all of these accounts.
>>
>> What I am curious about is whether there is an event that will be
>> recorded in our domain controller security logs for any computers that
>> have been disabled, but may still be logged on (for example, if a user
>> doesn't log off at the end of the day but instead locks their
>> workstation, they may be able to unlock it the next day and keep working,
>> in fact this is true because we have tested it). We want to make sure no
>> one is actually using a computer that had their account locked out.
>>
>> So, if we could search our event logs for a specific Event ID pertaining
>> to the computer being locked out, we could figure out if some of the
>> accounts we disabled are actually online and just hadn't updated the
>> computer account password in the normal 30 days for XP and 2000 desktops.
>>
>> -Tim Nichols
>> MCP
>>
>
>



Posted by Roger Abell [MVP] on September 23, 2006, 1:25 pm
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True, but it they are connected and will behave a remote command, they
would probably be much more simply located/discovered than by reboot
and comb the event logs.

> With that advice he could attempt to force a reboot of the computers using
> something like PsShutdown using a text file with the fully qualified names
> of the computers assuming they are connected to the domain network with
> the proper network connectivity.
>
> Steve
>
>
>> Tim,
>>
>> I thought about your situation last night for a while, but did not
>> see a usable solution for you.
>> If the machines of concern have not been updating their passwords,
>> they would not likely be doing so in the future - hence attempt to
>> see failure events when they do is not your solution (besides how
>> long it would take).
>> If there are machines in the situation you are considering, they are
>> already logged into the domain, and hence they are running on the
>> Kerberos tickets from then. When they renew it is not a new login
>> so you would not be catching login failure events. You could at
>> least in theory enable Kerberos detail logging, but the amount that
>> would be generated would probably make doing this not helpful.
>>
>> etc.
>>
>> My final feeling was that you may just have to wait, as the login
>> failures for abcdefg$ accounts would eventually show up, after
>> those machines are rebooted.
>>
>> Roger
>>> We are currently trying to remove old computer accounts from our Active
>>> Directory domain. We used a third party utility to find all of the
>>> computer accounts on the domain that did not have their password changed
>>> in 90 days or more. We then disabled all of these accounts.
>>>
>>> What I am curious about is whether there is an event that will be
>>> recorded in our domain controller security logs for any computers that
>>> have been disabled, but may still be logged on (for example, if a user
>>> doesn't log off at the end of the day but instead locks their
>>> workstation, they may be able to unlock it the next day and keep
>>> working, in fact this is true because we have tested it). We want to
>>> make sure no one is actually using a computer that had their account
>>> locked out.
>>>
>>> So, if we could search our event logs for a specific Event ID pertaining
>>> to the computer being locked out, we could figure out if some of the
>>> accounts we disabled are actually online and just hadn't updated the
>>> computer account password in the normal 30 days for XP and 2000
>>> desktops.
>>>
>>> -Tim Nichols
>>> MCP
>>>
>>
>>
>
>



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