Access Permissions for a second OWA virtual directory

Exchange 2007 server HUB-CAS Role (Windows 2008 R2)
To control access to external OWA users, I've created a second OWA  virtual directory using "New-OWAVirtualDirectory" cmdlet (and a website previously)
Everything works fine, except when you want to control access to this second OWA.
To do this, in the IIS Manager - > Authoritation Rules, remove the default Allow rule to All Users and configure Allow to a global group of Active Directory.
Then, when I get to the second OWA, get me the error:
The custom error module does not recognize this error

If I go back to reconfigure the Allow rule to All Users, returns to work, but I need to control access to this second OWA.
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fran61Connect With a Mentor Author Commented:
Five days ago I submitted this question and I havenĀ“t receive any answers.
It is supposed that the timeline is an important factor to get answers.
Do you know how much time I expect to wait to get answers??
fran61Author Commented:
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