Setting up a proxy server
If your computer connects to the Internet through a network protected by a firewall, you may need to specify proxy servers to get to webpages and other Internet resources.
Before you begin, ask your network administrator to tell you which type of proxy server to specify (for example, a web proxy server), the IP address or DNS name for the server, and a port number.
To set up a proxy server:
Choose Action menu > Preferences and click Advanced. (The Action menu is near the upper-right corner of the Safari window, and looks like a gear.)
Click Change Settings. The Internet Properties dialog opens. (If you are using Windows Vista, this dialog is named Internet Options.)
Click Settings, and use the information you got from your network administrator to change the settings.
The server is called a “proxy” because Safari sends requests for webpages to the server instead of directly to the website.