Time is an important value for authentification and other things and the reason to ensure from the beining it's working in your setup. Deploying Citrix Netscaler in a High Availability (HA) paair is very common, especially when we are talking about the VPX editions. First thing you should ensure is that the time between both Netscaler are in sync.

Let's start with there should be an Option in the Internet Information Service (IIS) application settings to set the default domain and hide the entry. It's really not that hard, so I don unterstand why Citrix isn't doing it.

Here a short description how to permanantly set your domain and then hide the domain filed from the Citrix Director logon page. 

Citrix Receiver... I don't even no where to start with all the issues I had/have and workarounds I have in place to make Receiver at least somewhat useable. The whole thing with Receiver/StoreFront is so "touchie"...anyway, now I just want to let you know something about proxies with Receiver.

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