Strange File Sharing Problem
 

I had a two machine LAN (all XP Pro) which operated symmetrically, i.e. each
machine could access the "Shares" given the by the other. I added a third XP
Pro machine and created two new shares for folders on that machine.

The problem is that, while both old machines can access the shares on the
new machine, the new machine can access the shares on only **one** of the old
machines!!

All machines have a "node type" of "unknown".

I have tried everything I can think of (including running the Create Small
Business Network wizard on all three machines.)

This asymmetric behavior strikes me as being bizarre.

I would be very grateful if some kind soul would please help me identify and
solve the problem which, BTW, is driving me "over the hill."