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Set up a proxy server using Safari on Mac
Your network administrator may ask you to specify a proxy server to access the Internet if your Mac connects to it through a firewall. Your administrator should tell you the type of proxy server to specify, the IP address or host name, and a port number.
Choose Safari > Preferences, then click Advanced.
Click Change Settings (next to Proxies) to open the Network pane of System Preferences.
Change the proxy settings using the information your network administrator provided.
Click OK.
See alsoEnter proxy server settings