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A page may be corrupted if a previous user interrupted its transmission and an incomplete page is stored in cache, or a user may wish to download a new copy of a page to ensure it is the most up-to-date.In Netscape Navigator, hold the Shift key and press Reload (Macintosh users should use option instead of shift). Netscape sends a special code causing all proxies on the way to bypass the cache, go directly to the source and cache the result.

Currently, Internet Explorer does not implement this facility. If you run a Squid server, you may also use the Cache Manager, cachemgr.cgi, which allows you to force a refresh of a cached object.

Internet security cache manager, Internet Explorer security, proxies, shift key

To block direct web access for your network(s) and force people to use proxies, you should add the following access list to your router LAN port (inbound).Here is a sample cisco router configuration:

router#configure terminal
router(config)#access-list 100 permit tcp any host 192.189.54.60 eq www
router(config)#access-list 100 deny tcp any any eq www
router(config)#access-list 100 permit ip any any
router(config)#interface Ethernet0
router(config-if)#ip access-group 100 in
router(config-if)#end
router#copy running-config startup-config

The option in the second line allows your users to use proxy.connect.com.au proxy autoconfig scripts. (NB: Using these scripts will bypass your proxy to use AAPT’s.)

This assumes that access-list 100 was unused. If you have your own proxy and want to bypass the Connect caches (permanently or occasionally) you need an additional rule which allows the cache access to port 80.

For example:

router(config)#access-list 100 permit tcp host xx.xx.xx.xx
any eq www

before the deny rule. Otherwise, you should configure your browsers to use proxy.connect.com.au, port 8080. Also, proxy.connect.com.au may be accessed for proxy auto-config.

If you are already using an inbound access-list on the LAN interface,then this has to be merged with your current list of course. The filter can alternatively be applied to the WAN interface (outbound).

Internet security caches, proxies, proxy auto config, web access, web proxy cache

If you are new to proxy servers and don’t know exactly what are they, here is a short explaination. A proxy server is a computer that is running a proxy server application, which allows you to connect to it, and request data. So, instead of surfing directly to a website, you can request that website from a proxy server, which will request it from the website’s server, and send it to you.

One of the main reasons why would you use a proxy is because using an anonymous proxy server to connect to websites, makes you anonymous. Because you don’t have any connection with the website, the website can’t get any information from you directly. All information it gathers, is sent from the proxy servers. This also prevents some malicious attempts that some websites perform on their visitors.

There are three types of proxy servers with different anonymity levels. A transparent proxy server offers no protection at all, so we don’t advise you to use them. The seccond type of proxy is an anonymous proxy, which protects you from revealing your computer’s IP address to websites. The last, most anonymous, is the so called elite proxy server, which also protects you from revealing your computer’s IP address. The difference between an anonymous and an elite proxy is that when using an anonymous proxy, websites do know you use a proxy, while the elite proxy servers don’t reveal this information.

You can surf our website by pressing the buttons on the menu above, selecting a category you are interested in. Once you are in the choosen category, you will see new related topics on the menu on the left. Our proxy tool section, offers some tools made by us, to help you in hunting proxies and testing your anonymity. Under applications, you can find applications that you may come handy to you once you know more about proxies. With each application, there also comes a small tutorial on how to use it. The tutorial section offers some basic tutorials that you might be interested in.

Read below about a website which give quiet details about proxies.

Explanantion 

Internet security anonymous proxy server, proxies, proxy servers, server application