Hello all,
Well I had the very same error on a SME 5.6U5.... that is I thought it was a U5. It fell short one tiny little update called 'proftpd-1.2.8p-es1' . I updated it and all is well now.
So check if your SME 5.6 has e-smith-proftpd-1.8.0-02 and proftpd-1.2.8p-es1 or in case of SME 6.0B3 if the latest updated packages have been updated. It worked for me, maybe its a similar problem on SME 6.0B3?
Usefull commands for checking which version you've got:
rpm -q e-smith-proftpd
rpm -q proftpd
Many thanks to Mark Knox at SME-bugs for helping me out, its much appreciated.
With kind regards,
Jan