I use NS7…
but I have tried the jail on a virtual box with NS6 too… same behavior when using a misconfigured client… (however sending the logs of NS6 is a bit difficult for me since I have no ssh on it - due to a misconfiguration of the network adapters…).
the apache-auth jail (and other jails) are working perfectly and also the new jail for openVPN works if I configure the client rightly and only use wrong authentication data (e. g. wrong passwords)…!