Have a look at the following URLs:
http://www.microsoft.com/isaserver/e.../downloads.asp

http://support.microsoft.com/default...;EN-US;q190997

Hope this helps. Remember that Gnutella continuously receives and sends traffic, as opposed to many other protocols such as HTTP, SMTP, etc. Some clients may also have an issue where it drops connections often (and thus has to reestablish connections equally often). While NT Server and all other 'Server' versions are less prone to these issues, issues still exists (and more likely for a proxy server).

-- Mike