When you have multiple virtual directories in Owa 2010 with different authentication mechanism, one of them NTLM or Basic and otehr FBA, you have to change the externalauthenticationmethod of the virtual directory with Basic or NTLM to reflect the same value as in the internalauthenticationmethods.This value is FBA as default and in an scenario with 2 CAS 2010 in different sites with silent redirection it goes to the first virtual directory with externalurl value set, if no externalauthenticatio
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