File README.SUSE of Package vsftpd

Starting with 10.1 vsftpd can be configured standalone
or over the xinetd superdeamon. Default is standalone.

If you want to run it over xinetd make sure the you enable
the service in the xinetd configuration (/etc/xinetd.d/vsftp)
and set the following line in /etc/vsftpd.conf

listen=NO

This is needed for vsftpd to over xinetd.