Network Access Win98

I have a 4 computer network. 1 machine operates as a
server and desktop. When i start the machine and leave it
at the first network logon in windows (which does not
require a password) all the other machines work fine and
access sage through the machine. As soon as i go past the
logon screen the computer then locks the other machines
out. All computers are on the same workgroup and they were
all working fine yesterday. So whats changed overnight??.



Mat