SYMPTOMS:
A computer that is running Microsoft Internet Security and Acceleration (ISA) Server 2004 may block User Datagram Protocol (UDP) traffic between two networks.
CAUSE:
This problem occurs because the ISA Server 2004 incorrectly processes the UDP requests.
For more information and a solution, check out: http://support.microsoft.com/default.aspx?scid=kb;en-us;915461&sd=rss&spid=2108#
HTH,
Tom
Thomas W Shinder, M.D.
Site: www.isaserver.org
Blog: http://blogs.isaserver.org/shinder/
Book: http://tinyurl.com/3xqb7
MVP — ISA Firewalls