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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.
In the Safari app
on your Mac, 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.