computer disconnecting from AD network

[Mark]

One of the laptops that I support doesn't seem to be staying logged on to our
AD network. He logs on correctly while plugged in locally (the name John Doe
shows correctly when you click on the Start button), but after a time from
five minutes to an hour he seems to be logged off: the name changes to the
actual login name (johnd) and any security on network folders won't let him
access them anymore.

When he enters his login info on the window that pops up it says it is
identical to his computer login and has already tried that. When I use the
same login on another comptuer everything works properly.

This laptop was an upgrade from XP Home to XP Pro before it was joined to
the network, so I wasn't sure if that had anything to do with it.

Not sure if it's related or not, but this laptop cannot do Windows Updates
either - not even when I am using the local admin account.

 

[Mark L. Ferguson]

There is a local policy setting available in GPEdit.MSC that would allow
setting a time limit like that.
Policy list: http://www.boyce.us/gp/gplistall.asp
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Mark L. Ferguson
..

 

[Mark]

Which one? The only ones I could find on that list that seemed related were
for terminal sessions.

 

[Mark L. Ferguson]

There were SP1 changes in Kerberos, but I don't know if that would apply. I
would look at their IE, Tools menu, Options, Security tab, Intranet zone,
Scroll to Authentication. If the wrong credentials are offered it might be
timing out.

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Mark L. Ferguson
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[Mark]

The cradentials seem to be correct, I am able to access network folders and
printer during the short time in the beginning.

 

[Mark L. Ferguson]

Yes, I would expect that if they were a member of the same name Workgroup,
as the Domain name. It will be easy enough to look at the system applet to
check for workgroup versus domain. Other than that, there must be some
profile corruption going on. It would be hard to guess how to spot that.
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Mark L. Ferguson
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[Mark]

Is this possibly one of the issues that comes along with the upgrade from
Home to Pro? I have heard that upgrade is notoriously problematic.