Kerberos failures on Win 2008 R2(IIS 7.5) KDC_ERR_ETYPE_NOSUPP

Symptoms We have migrated our web application from Windows 2003 server to Windows 2008 R2 server. The web application makes a call to another web service on a separate server. This call is failing with 401 unauthorized error. Cause By default, Data Encryption Standard (DES) encryption for Kerberos authentication is disabled in Windows 7 and…


Issues when using ASP.net delegation with client certificate mapping on IIS 7.0

Recently I came across an issue that I would like to share with everyone. We had a .net 3.5 web service hosted on IIS 7.0. We have configured it to accept a client certificate with a 1-to-1 mapping to a domain account. When presented with the cert the service appears to run as the account ok…

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