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I want to know whether it will affect users if I reboot my server? Can I find out who is currently logged on to my Windows Server 2003?

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did you mean reboot? – JamesRyan Jan 4 '12 at 16:16
yes. wording changed. thanks – Blanthor Jan 4 '12 at 16:26
up vote 3 down vote accepted

Computer Management -> Shared Folders -> Sessions

This will show current users logged in users to any Shares (Printers/Mapped Drives/Etc). Then I usually check Open Files and notify those users.

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If you're talking about workstation authentication... then there's no way to tell from the server who is logged in. You must go to each workstation (or write a script to do it for you) and look at the "LOGONSERVER" environment variable. Rebooting a server won't force users to log off though. – TheCompWiz Jan 4 '12 at 16:08

Yes, see How Can I List Open Sessions and Open Files on a Computer?

If it is a DC the effect will be that users cannot authenticate to that DC until it's back up (that may or may not be an issue depending on your environment)

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