You could upload a custom block page that redirects to the site you want your clients redirected to.
You will need to create a redirect page with the following information
<meta HTTP-EQUIV="REFRESH" content="0; url=http://www.yourdomain.com/index.html">
Save it with an identifiable name - I used url-custom.txt
Scroll down to URL Filtering Block Page
Select the file created above and click OK
Commit the change
That should do it.
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