This is for network administrators.
In order for users on your network to use Insync, your firewall rules should connect to the following hosts and ports. Otherwise, users may be blocked or denied access from these services.
www.insynchq.com:443/HTTPSr4.insynchq.com:443/HTTPSs.insynchq.com:80/HTTPfirebase.insynchq.com:443/HTTPS- Google Drive’s hosts and ports.