single sign on iis 7.5 multiple application pools

I have a webapp in two parts (website and webdav part). Both are running in a seperate application pool in IIS 7.5 due a different framework.

I want to use single sign on for both parts. For the first part (website) its running fine but for the webdav part single sign on doesn't work with a windows 7 client. When I try with application users (no single sign on), everything works fine for both parts.

Both application pools are running with the sam开发者_运维技巧e service account.

I searched on the internet for a solution, but didn't find anything that worked. Does someone know how that I can solve this problem or got a manual to configure this?

Thanks

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http://www.codeproject.com/KB/aspnet/SingleSignon.aspx

http://www.codeproject.com/KB/web-security/aspnetsinglesignon.aspx

http://msdn.microsoft.com/en-us/library/ms972971.aspx