How to stop brute force attacks on our TFS 2010 going through our reverse proxy?

I have setup TFS 2010 to connect to the internet via our reverse proxy.  Now I would like to stop brute force attacks to ban ip addresses that keep trying to 'guess' passwords.  Is this an IIS change or a reverse proxy change?  If it is a IIS change what do I need to do to stop people from guess TFS passwords?
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IandINSWAsked:
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Mohamed OsamaSenior IT ConsultantCommented:
- USE complex passwords whenever possible.
- Always Use HTTPS for Published TFS implementations
-Block the offensive IPs using IIS

http://www.winserverhelp.com/2010/07/creating-ip-address-restrictions-in-iis/
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