Vsftpd

vsftpd (Very Secure FTP Daemon) is an FTP server for UNIX-like systems.

seccomp filter sanboxing with vsftpd 3.0.x
The following error may occur on ftp clients with vsftpd 3.0.x:

500 OOPS: priv_sock_get_cmd

This is caused by seccomp filter sanboxing, which is enabled by default on. To workaround this issue, disable seccomp filter sanboxing:

For further information, refer to Red Hat bug #845980.