[Samba] problems logging in

[Joe]

For some reason our login time to samba 3.0.4 has
went from seconds to 5 minutes or so.  I've changed
nothing on the server.  This problem started today.
Here's a link to an ethereal capture. (text)  This
shows logging in from an XP machine (10.0.0.55).
The server is 10.0.0.8.  Win98 machines apparently
do not have the problem but all of our XP machines
do.

http://www.rmtohio.com/cap.txt

Can anyone tell what is going wrong?