proxy server

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Related to Anonymous proxies: Anonymous proxy server

proxy server

Computing a computer that acts as an intermediary between a client machine and a server, caching information to save access time

proxy server

[′präk·sē ‚sər·vər]
(computer science)
Software for caching and filtering Web content to reduce network traffic on intranets, and for increasing security by filtering content and restricting access.

Proxy Server

(software, security)
Microsoft's proxy server and proxy gateway, designed to provide extensible firewall and network security. Proxy Server is part of BackOffice.

proxy server

(programming, World-Wide Web)
A process providing a cache of items available on other servers which are presumably slower or more expensive to access.

This term is used particularly for a World-Wide Web server which accepts URLs with a special prefix. When it receives a request for such a URL, it strips off the prefix and looks for the resulting URL in its local cache. If found, it returns the document immediately, otherwise it fetches it from the remote server, saves a copy in the cache and returns it to the requester. The cache will usually have an expiry algorithm which flushes documents according to their age, size and access history.

Compare proxy gateway.

proxy server

A proxy server is a computer system or router that functions as a relay between client and server. It helps prevent an attacker from invading a private network and is one of several tools used to build a firewall.

The word proxy means "to act on behalf of another," and a proxy server acts on behalf of the user. All requests to the Internet go to the proxy server first, which evaluates the request and forwards it to the Internet. Likewise, responses come back to the proxy server and then to the user.


Proxy Servers Provide Anonymity
Like a virtual private network (VPN), a proxy server hides the user's IP address when accessing the Internet. See VPN and TLS.







Address Translation and Caching
The proxy server is a dual-homed host with two network IP addresses. The address on the outbound side is the one the Internet sees. Proxies are often used in conjunction with network address translation (NAT), which hides the users' IP addresses on the internal network. Proxy servers may also cache Web pages so that the next request for that page can be retrieved much faster. See NAT and proxy cache.

Other Proxies
Anonymous proxy servers let users surf the Web and keep their IP address private (see anonymous proxy). Although not specifically called proxies, Internet email (SMTP) and the Usenet new system (NNTP) are somewhat similar because messages are relayed from sender to recipient. See firewall.

Application Level and Circuit Level
"Application-level" proxies or "application-level gateways" are dedicated to specific content such as HTTP (Web) and FTP (file transfer). In contrast, a "circuit-level" proxy supports every application (see SOCKS).

Forward and Reverse Proxies
In this definition, the proxy servers are "forward proxies" that hide the details of the clients from the servers. However, proxies can also reside at the website to hide details from the clients (see reverse proxy).


A Proxy Server in a LAN
In this example, the proxy server functions as a firewall in the public side of a company network, which is called the "demilitarized zone" (see DMZ).
References in periodicals archive ?
For a business like 121 Financial, anonymous proxies are just one of 50 default settings, including categories for shopping and travel sites, that Tru-Views uses to filter up to 6 million web pages a day.
With an increasing number of anonymous proxy sites now being access via HTTPS, the latest version of Tru-View Technology is now also able to identify and block these in real-time offering enhanced protection against anonymous proxies and allow IT managers to continue to provide a secure environment.
SurfControl's reliance on lists of URLs to determine which sites were subject to filtering enabled pupils to attempt and in some cases succeed in bypassing the filtering system through the use of anonymous proxies, claimed the school's Network Manager.
The R3000 Internet filter, which uses Intelligent Footprint Technology allows school districts to identify anonymous proxies and block access to inappropriate and unauthorized sites while at school.
One way they do so is by using anonymous proxies. By configuring their home computers as proxy servers, and then tunneling into them, students can get around a standard filter and gain access to just about any site imaginable.
With visibility and control over all HTTP traffic, administrators can enforce a blanket policy for all users or restrict some groups while allowing others open access to anonymous proxies.--Cymphonix