I have several users who are logged into Active directory Windows server 2003 std. the computers run windows xp pro. They are logged in for about 7 hours a day when all of a sudden, around 2 pm, they lose internet connection. A reboot fixes it, but what could be the cause? and solution? it does not affect everyone, but consistantly affects about 20% of network users. Does anyone have any ideas? I have rebooted the firewall. No changes have been made to AD or the users.