ITShield Inc. (http://www.itshield.com) released a patch - p10004 for every
version of ITShield Firewall. P10004 fixes a bug in proxy_pop3.
ITShield Firewall, a transparent firewall, contains the advantages of all
three critical firewall architectures - packet-filtering, Stateful
Inspection, and application gateway firewall. Because application proxy
provides the highest level of security and flexibility, ITShield Firewall
handles all the sessions in application-level by default. ITShield Firewall
can handle more than 5000 TCP sessions, unlimited UDP sessions, and
unlimited IP sessions at application-level in parallel. Furthermore,
ITShield Firewall can drop the unwanted requests at packet level. If the
high-speed network traffic keeps the firewall very busy, the administrator
can enable Stateful Inspection.
ITShield Firewall supports PPTP VPN and IPSEC VPN. It is very easy for you
to configure them.