We have a 2000 proxy server installed in our company. We wanted to authenticate the users who need to access the...
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Internet across this proxy, so we made the authentication by the "default Web site properties" by disabling anonymous access and made a restricted access to the users from specified IP addresses. The problem is that the users can't use Messenger and Real Player and others programs. I tried to use the winsock proxy, but without any result. Thank you. I don't know of a great way to do this. One not-so-great way is to configure your users with fixed IP address (i.e., not DHCP-assigned) and to implement source-IP address filtering for messenger and Real Player.
Another option is to allow access to those applications from all IP addresses, but use group policies to "lock-down" the desktop environment. In other words, stop your users from running those applications at all.
Sorry I don't have a better answer -- those protocols weren't designed for use with authentication to a proxy server.
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