WIN98 vs. XP vs 2003 server

I have a neetwork with 2003 as the Domain controller,
Printer on Xp (pro) machine, and a 98 workstation.
Issues with 98 machine are:
#1) long time to see domain
#2) it quit seeing the printer which is shared On the XP
machine.
#3) It cant brouse the domain.
All permissions are default and it use to work right.
Problems started after new DSL was installed with
a "Sonic Wall" firewall. I've recrearted accounts and
reset permissions accross the domain. This has to be a
simple fix.

Sounds to me like the firewall is set a little to strong, and is blocking
the Win98 machine.