An Introduction to Proxy Server 2.0 Services

* WebProxy: Web Proxy normally functions with both clients and servers. As a
server, it receives HTTP requests from internal network clients. As a
client, it responds to internal network clients' requests by issuing their
requests to a server on the Internet. The interface between the client and
server components of the Web Proxy service provides chances to add value to
the connections it services. By performing advanced security checks, the Web
Proxy does more than relay requests between an internal client and a server
on the Internet. The WebProxy service is an extensions of Internet
Information Server 3.0. It consists of two following components: The Proxy
Server ISAPI Filter and the Proxy Server ISAPI Application. The Web Proxy
service is implemented as a DLL (dynamic link library) that uses ISAPI
(Internet Server Application Programming Interface) and therefore runs
within the IIS WWW process. The WWW Service must installed and running in
order for proxy requests to be processed.

* WinSock Proxy: WinSock Proxy provides proxy services for windows sockets
applications. WinSock Proxy allows winsock applications to function on a LAN
and to operate as if it is directly connected to the Internet. The client
app uses Windows Sockets APIs to communicate with another application
running on an Internet computer. WinSock Proxy intercepts the windows
sockets call and establishes a communication path from the internal
application to the Internet application through the proxy server. The
process is totally transparent to the client. The WinSock Proxy consists of
a service running on Proxy Server and a DLL installed on each client. The
DLL it relies on is the Remote Winsock DLL that replaced the normal
winsock.dll. WinSock Proxy uses a control channel between the client and the
server to manage the ability of Windows Sockets messages to be used
remotely. The control channel is set up when the WinSock Proxy client DLL is
first loaded, and it uses the connectionless UDP protocol. The Winsock Proxy
client and the WinSock Proxy service use a simple ack protocol to add
reliability to the control channel. The control channel uses UDP port 1745
on the proxy server and client computers.

* SOCKS Proxy: Proxy Server supports SOCKS Version 4.3a. Almost all SOCKS
V4.0 client applications can run remotely through SOCKS Proxy. SOCKS is a
protocol that functions as a proxy. It enables hosts on one side of a SOCKS
server to gain full access to hosts on the other side of a SOCKS server,
without requiring direct IP access.

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