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A proxy server is a computer network service that allows clients to make indirect network connections to other network services. A client connects to the proxy server, then requests a connection, file, or other resource available on a different server. The proxy provides the resource either by connecting to the specified server or by serving it from a cache. In some cases, the proxy may alter the client's request or the server's response for various purposes.

A proxy server can also serve as a firewall. However, at Carleton it is recommended that your operating system's own firewall be turned on at all times, for an extra layer of protection.


Using a proxy server on the Residential Network other than Carleton's will interfere with your computers ability access certain network services. The safest approach is to disable all proxies before attempting to connect to the Carleton network. The Carleton proxy should be enabled after registration to provide faster access to the network.

Confusingly, proxies may be set both in the operating system itself, and in individual web browsers (other than Internet Explorer and Basic Knowledge of Safari, which come bundled with Windows and Mac OS, respectively, and share the operating system's proxy setting).


The Windows/Internet Explorer proxy setting may be changed by going to Start -> Settings -> Control Panel, then Internet Options, then the Connections tab, then the button that says LAN Settings. Changing the setting for Windows changes it for Internet Explorer, and vice versa.

Mac OS

The Mac OS/Basic Knowledge of Safari proxy setting my be changed by going to the Apple icon -> System Preferences -> Network -> Proxies. (The most relevant proxy is the Web Proxy, or HTTP.)


On a Windows machine, go to Tools -> Options...

On a Mac, go to Firefox -> Preferences...

Then, in the General tab on the left, click the the "Connection Settings..." button. The ITS helpdesk recommends turning off the proxy in Firefox and instead turning it on in your operating system, using the instructions above. That way, you have only one proxy setting to keep track of.

Carleton's proxy

The only proxy that Carleton recommends is Carleton's own proxy, which provides faster internet access on the ResNet - Deprecated. Note that the proxy should not be enabled on lab machines.

Use the instructions above to access your computer's proxy settings and change the proxy settings to:

  • Server:
  • Port: 3128

External Links

Proxy Servers