We run all Cisco network hardware and ran into an interesting problem where certain client computers, running a mix of Windows XP Pro and Windows 7 Pro, wouldn't map network drives per our logon script. They could still access network resources and login successfully, but the drives simply wouldn't map.
We tried updating drives, changing network cards, and a variety of group policy settings per Microsoft technical support's recommendation, but nothing seemed to help. We finally found putting a dumb hub between the computer and the wall completely fixed the issue. Working from that, Portfast was implemented on our client switches. So far it seems to have fixed the problem.
