winxp sp2 add to win2003 domain

hi all

I have built a domain controller in virtual machine using win2003 server for testing purpose.
also i have install couple of xp pro with sp2 in other virtual machine. 2 of my xp machine was able to join the new domain controller fine . but one of my xp machine , doesnt wanna join.i get error saying : “the folowing error occur when attemting to join the domain , specified network name is no longer available” . but i can ping my domain controller using both ip and name.. so does anyone have any idea what is causing this problem and how can i resolve this issue. Thanks in advance .