Some domain clients disconnect from the server after 8 hours and must be rebooted to reconnect to domain resources

Hi,

We have a Windows 2003 Domain with at least 250 domain members running XP. About 10% of these machines disconnect after about 8 hours (always around the same time of day) and then they cannot access the domain controller as it says the user is not logged in. They are spead all over the company on different switches so I dont believe its a network problem. They cant print, browse shares, etc until they logoff then back in. They do have network connectivity and can browse the internet fine. Since the clients are nearly identical I do not know what would cause some to have this problem and not others. Any ideas?
borgmemberAsked:
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firemanf29Commented:
It sounds like the NIC is powering down.  Check the Windows and BIOS power save settings.  Make sure all desktops are set for always on in windows and turn off BIOS power saving settings.  You may wantt o update any NIC drivers to the latest version also.  I remember a Dell broadcom driver causing something like this a year or so back.
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AmericomCommented:
How is the user being logoff, like does the user get any warning message? Are they actually being logged off completely at the "Ctrl+Alt+Del" Window? If so, you may want to check on the screen saver and see if there is a "Logoff Screen Saver" that logs off users after certain time.  I'm still making sense out of the word you used "disconnect" vs logoff...
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borgmemberAuthor Commented:
They can be at the machine or not and network to domain resources are dropped. Such as their outlook with say "disconnected" or offline suddenly. If they hit send/receive it prompts for the login. If they try and go to the domain controller via network neighborhood it says invalid username/password or disconnected.
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borgmemberAuthor Commented:
All power save options were set to off. However the nic was set to go to standy if the system does. Even the desktops that do not have this issue had that setting set. But to eliminate it further I turned off the checkbox to allow the nic to go into standy mode. The next day clients report the same problem. Any more ideas?
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AmericomCommented:
What did the event log show? Any indication of what happend just before the user got disconnected or offline? Like any service failed hang on the user's workstation such as computer browser, tcp/ip NetBIOS helper, workstation services. Same question on the server more on your domain controller.
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borgmemberAuthor Commented:
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Windows Server 2003

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