Ron, you can add a Meta-Refresh to the header of that page to get what you are wanting.  I thought that the Link Url setting worked that way, but I guess not.

In that page's settings, under Advanced Settings, there is a textbox labelled "Page Header Tags."  Inside of that, you can add your meta-refresh to redirect users to another site.  For example, add <meta http-equiv="refresh" content="2;url=http://www.yahoo.com"> to refresh to yahoo.com after two seconds.

After you do that, you will need to access the page from the Pages page under the Admin menu, since you won't be able to get to that page any longer.

Hope it helps!

Sorry, i suppose I misspoke when I said to access the page through the admin menu.  I meant that you could access that page's settings, you won't be able to access the page at all with this solution.  If all it is doing is redirecting, I was thinking that you wouldn't need to access the page itself.  Do you need access to the page for any reason?

Let me know,

We have a dotnetnuke redirect module for sale on snowcovered that does exactly what you want.   Just add this module to your page that is only accessable by registered users, and in the settings, set its redirect url to your desired final destination. 

The unathenticated user will not see the final url, so they can not copy it.  Once redirect is on, you can not load the page in order to turn it off (since it will redirect away from the page).  The included help file tells you how to turn the redirect off without being redirected away from the start page.

JK