Passthrough authentication not working with a server alias

Passthrough authentication not working with a server alias

I've recently enabled passthrough authentication on our SDP instance (9.3 build 9300) and whilst passthrough authentication works fine when I browse direct to the server name, when we use the DNS alias for the server (a *much* friendlier and easier to use name) I either get a pop-up asking for my username and password or get redirected to the logon page.

Is there somewhere in the configuration that I can specify a URL alias so that passthrough authentication will work using this URL?

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