Setting this paramter to no prevents winbind from creating custom krb5.conf files. Winbind normally does this because the krb5 libraries are not AD-site-aware and thus would pick any domain controller out of potentially very many. Winbind is site-aware and makes the krb5 libraries use a local DC by creating its own krb5.conf files. Preventing winbind from doing this might become necessary if you have to add special options into your system-krb5.conf that winbind does not see. yes