How to block download extensions
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The way that thing works is it inserts the proxy settings for random open proxies on the net into the web browser configuration. It leaves those setting there when you un-install the browser add on. It also removes any previous proxy settings you had in the browser.
So, if the proxy settings you had in the browser to begin with are what directs the users into your proxy, when they run that browser add on, your proxy will be replaced with the stealthy proxy. Then when you uninstall the stealthy proxy, there is no proxy at all.
So, if a browser on your network with no proxy settings can access the web, then they will be able to access HTTP or HTTPS.
So, besides blocking the 3128 port to the internet for clients, you should probably also block port 80 and 443 from the LAN to internet for those computers, so that the only way to get to the internet is via your proxy.
So, if access for your computers is supposed to go:
Computer > squid on port 3128 > internet
Then you can block their 80 and their 443 to the web, along with their 3128 to the web.
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uhm sir kejianshi,
im doing well with dansguardian,
but i have this one scenario when on of users have an access which is not
applicable to others,i've tried the users in dansguardian but the result is failed,
is it really possible sir?
tnx