Geocortex essential send null referrer

I had configured Geocortex to sign in using windows authentication.

When tried to add a secured service from our enterprise (federated environment without a hosting server) get a connection failed although with configured a dot net proxy, in the proxy logs there is an error that geocortex sent a null referrer.

Is there any way to let the geocortex send a valued referrer or is needed to add a specific referrer URL for geocortex in the proxy.config file since it works once add * (which means allow any referrer to be passed)?

Any idea?