KC ChangIn the Webster dictionary, "proxy" means "a person authorized to act for another". On the Internet, the proxy serves the following purposes:
The first HKU proxy was installed on the central Information Server (see CC News Oct-Dec 1995). Since that time, network usage has increased many fold and the proxy service had been very strained. In order to relieve the loading on the HKU web server, we have disabled the proxy service on www.hku.hk (hkusuc.hku.hk) so that it is no longer available. Users are advised to configure their web browsers with the following proxy settings:
- A proxy server acts as a gateway that separates an institution's network from the outside networks, and it can act as a firewall server that protects a private network from outside intrusion. For example, the HKU intranet is a private network, and it is not available to users of other networks. Access control to some restricted sites (e.g. the library electronic resources) can be easily achieved using a proxy server.
- A proxy also serves as cache server for storing webpages. If you request a webpage from an external site outside of HKU, the browser will first look for the page on the proxy server. If it finds the page, it returns it to the user without searching on the Internet. If the page is not found in the cache, the proxy server, acting as a client on behalf of the user, uses one of its own IP addresses to request the page from the server out on the Internet. When the page is returned, the proxy server relates it to the original request and forwards it on to the user. The caching of frequently accessed web pages shortens the response time. The use of proxy conserves the use of the Internet bandwidth as the bandwidth is shared amongst the eight tertiary institutions in Hong Kong.
The use of the automatic proxy is recommended as it allows our Centre's staff to suitably add/remove proxy servers to our network configuration without any user disruption. Users can go on using the proxy service without noticing any adverse effect from maintenance work done on any of our proxy servers. For details on the HKU proxy settings, please refer to Computer Centre's FAQ page on PPP.
- automatic proxy at URL: http://www.hku.hk/local/cc/proxy.pac (preferred set-up)
- manual proxy settings with server: proxy.hku.hk and port: 8282
When using the HKUPPP, ACEnet , Hallnet or VPN networks, you must configure the proxy server in your browser or you will not be able to access websites outside of HKU.
Please contact the undersigned if you have any enquiries about the HKU proxy service.