samba - Oct 2003 - windows XP dialup can't connect

I am having problems connecting a windows XP pro machine to my samba 3.0 
server over a isdn diaup.  I have 2 other windows 2000 pc's that connect 
fine over the isdn, but the winXP gives me(the network path 
\\192.168.53.3\vl could not be found error).  This computer works fine 
on the local network, so it is the isdn dialup and windows XP since my 
windows2000 pc's work.  At least I would think so.  Any ideas?

Thanks,
    Greg