The proxy server does not appear to be listening on any ports whatsoever, and appears to be operating with some degree of “stateful” processing. I’ve built a few proxy servers, including one at home that I’ve been unable to break into through the Internet when I’ve tried. I don’t know if there is a built-in setting for ICQ but you can add a custom packet filter to allow certain types of traffic in or out depending upon various criteria. The best bet, security wise, is to configure the proxy server with two interfaces, one on the Internet (or downstream from a firewall) and one on the internal network segment and enable packet filtering between the two interfaces. I believe that you could set up ICQ support by using the Microsoft Proxy Client on each windows workstation that needs that connectivity.
Yes, MS proxy does support cascaded proxy servers, they use the term “array” to describe this (to describe multiple proxy servers in a chain).
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