Microsoft ISA 2006 Blocking files from SharePoint.

External users are unable to open documents from SharePoint, When a document is opened SharePoint asks for authentication and then loads the ISA connection screen in a word document.
I have attached the screen shot of this error.
If an external user users a VPN and then loads SharePoint everything loads ok. I believe this is a problem with ISA blocking connections to SharePoint. When setting up ISA I used a standard SharePoint publishing rule with no SSL.
Everything else works fine but opening documents.  

Sharepoint-problems1.xlsx
DanJEvansAsked:
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DanJEvansConnect With a Mentor Author Commented:
I have managed to solve this problem; it seems that the fault was with office 2010 and basic authentication. Apparently office 2010 does not support basic authentication with SharePoint so I have added the following registry key and its now working fine.  

HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\Internet, add a  DWORD called  BasicAuthLevel with a value = 2

 
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Suliman Abu KharroubIT Consultant Commented:
Do you enable link translation on publish rule ?
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DanJEvansAuthor Commented:
Yes this is enabled. Http:\/\/example.com to http:\/\/example.com
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DanJEvansAuthor Commented:
I have managed to solve this problem; it seems that the fault was with office 2010 and basic authentication. Apparently office 2010 does not support basic authentication with SharePoint so I have added the following registry key and its now working fine.  

HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\Internet, add a  DWORD called  BasicAuthLevel with a value = 2
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DanJEvansAuthor Commented:
sorted
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Suliman Abu KharroubIT Consultant Commented:
Glad to hear that...

Thanks for sharing.
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DanJEvansAuthor Commented:
This is now working fine.
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