Thanks Jon - I was actually after setting for the Client. The client doesnt seem to route all requests via the server address, especially when you get to the Delivery > Images section. It seems to make requests outside of the server host. I need to know if the client can force a proxy server for all requests?
Interestingly no - the resource URLs use another hostname (other than the server) which we have added to the proxy auto-config, but the client seems to bypass that when requesting the image resource URLs. The rest of the requests seem to be proxied properly. As the image resources are bveing queried outside of the proxy, the server security whitelisting fails and we get a request error.