FTP on Linux "Failed to retrieve directory listing" not firewall issue

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http://serverfault.com – I've got an VPS in germany running Debian X64. I have very strange issue. I have ISPConfig CP installed using proftpd and I can not connect to FTP by any means. Few hours ago I've had installed DirectAdmin on CentOS same VPS and same issue. Simply when I connect to FTP server I get these: Status: Resolving address of web02.defikon.com Status: Connecting to Status: Connection established, waiting for welcome message... Response: 220---------- Welcome to Pure-FTPd [privsep] [TLS] ---------- Response: 220-You are user number 1 of 50 allowed. Response: 220-Local (HowTos)