The Security Services > Settings page is available for appliances running SonicOS Enhanced 5.6 and higher.
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3 Select Download Signatures through a Proxy Server.
4 In the Proxy Server Name or IP Address field, enter the hostname or IP address of the proxy server.
5 In the Proxy Server Port field, enter the port number used to connect to the proxy server.
6 Select This Proxy Server requires Authentication if the proxy server requires a username and password.