VSFTPD command ls hang

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http://serverfault.com – I have a ftp server with vsftpd. and if I do command ls always hang. Previously run well, some of the time when I log back in when this happens like this. user@serverubuntu:~$ ftp localhost Connected to localhost. 220 SERVER FTP Name (localhost:user): usernametes 331 Please specify the password. Password: 230 Login successful. Remote system type is UNIX. Using binary mode to transfer files. ftp> ls 200 PORT command successful. Consider using PASV. 150 Here comes the directory listing. And hang. Below my config vsftpd.conf in /etc/ listen=YES anonymous_enable=NO anon_world_readable_only (HowTos)