https://www.dotnetzone.gr:443/cs/blogs/papadi/archive/2010/02/17/windows-authentication-in-wcf-services.aspxClick here to download: WindowsAuthenticationTest.zip (17 KB) There aren't may things one has to do to enable windows authentication in a WCF service. Actually Windows Authentication is by default enabled when using most of the standard bindings of WCF.elCommunityServer 2.1 SP3 (Build: 20423.1)