The Symantec Endpoint Detection and Response appliance uses the network proxy during communications outside of the network, such as when the appliance downloads virus definitions from LiveUpdate or contacts Synapse for analyses.
You can configure access to a network proxy that requires Basic Access Authentication (BA) or no authentication at all.
There are some required domains and URLs that Symantec EDR must be able to access. Your proxy server must be configured to allow access to the same required domains that your firewall must be able to access. See Symantec Endpoint Detection and Response Installation Guide for more information about required domains for your firewall server.