ocr: a - à : 4 - a - d * * - - : apure 5 Administrators, can define redirection (proxy)rules that specity not only the host resource clients can access, but also through which specific ports hosts will be accessed;this lets administrators set up a proxy to an unusual port, instead of a well-known port for a given service (such as port 80 for HTTPfor example). Using nonstandard ports helps to disrupt poten- tial hacker attacks. (In the background is the client configuration tool main screen.)