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Q: 

SharePoint web part access to file share using Kerberos from Extranet via ISA doesn't work.

I have the following scenario:

  • A web part on Sharepoint Web Server accesses a file share on another server
  • Kerberos authentication is set up and INTERNALLY files on the share can be successfully accessed
  • Our SharePoint site is published externally via ISA with forms based login for authentication
  • Kerberos authentication is working from ISA as confirmed by kerberos logging
  • EXTERNALLY the web part cannot access the file share.

I think I have all the correct SPN's set up for the ISA server to allow it to delegate through to the file share box.

I have read every conceivable article I can find to no avail. My gut feel is it has something to to with SPN's. Is there something special that needs to be done via ISA to make this work?

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