we have upgraded our WSS 3.2 installation to Sharepoint Foundation 2010 and have trouble with authentication over client certificates (works perfect with WSS 3.2).
You can reproduce this with a fresh install of SharePoint Foundation 2010 on Windows Server 2008 R2. Create an application and set in IIS authentication to Client Certificates. Then create a site with one document library and upload at least two documents.
Message: Object expected
I found following HTTP 500 error in IIS-Log:
2010-05-21 13:20:01 192.168.1.86 POST /_vti_bin/client.svc/ProcessQuery - 443 XXXX\XXX 192.168.XXX.XXX Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.1;+WOW64;+Trident/4.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+InfoPath.2;+.NET4.0C;+.NET4.0E)
500 0 0 188
If i switch authentication in IIS to Windows Authentication i get no error (HTTP Status Code = 200).
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