Windows XP SP3 802.1x Authentication Wired Network - Logon Problem

we using:

 

windows 2003 r2 domain controller/ias server

cisco authenticating switch

windows xp service pack 3 client computer

 

the problem have when try logon xp domain user credentials unable logon because the domain controller can't found/contacted - computer authentication completes after desktop appears.

if logon cached domain credentials (i.e. skipping need domain controller) authentication completes successfully.

basically need find way of forcing authentication complete before logon process starts (using computer certificate/authentication , not user authentication) users can authenticate domain controller , logon normal whilst still preventing unauthorized access devices.

 

turned out switch configuration issue in end - our network resource had misconfigured routing meant never have worked until change made allow client route domain controller.

once change made able log onto domain.

Windows Server  >  Network Access Protection