System: AMD Athlon 1000; Novell Netware 5.1 SP6; Border Manager 3.6.
SP2a.
All last updates installed.
Client connects over IPX Gateway with Single sign-on authentication.

Probelm: ICQ 200x can't connect to login server, Miranda IM hangs on,
but
ICQ Lite and Trillian works perfectly.
ACL consist of 2 rules: first - allow everything, second (default) -
deny
everything.

Unlimited beer to rescuer!!!! :)