Funny logon problems

When a win2k box logs out, say to go home, the next day, the server won’t authenticate it. The logon process takes a long time, but if it is a complete shutdown, the computer logs on no problem. HAs anyone had this problem? We have an internal DNS on a win2k server machine which is also running DHCP, IIS, RAS, and everything else. But it seems to handle it quite well, except for that little quirk. If you can please help.

Thanks

Juan