If you have problems setting up an FTP server or issues accessing your FTP site, here are two basic tips that have helped our customers before to make their FTP server work properly.

1. Check if the FTP daemon your are using is installed correctly and is running
2. Verify the software firewall rules

The FTP server should be allowed to accept TCP connections to port 21, and to make TCP connections from port 20 to any port

For further details, here are helpful instructions on how to setup your FTP server:

FTP Configuration in Linux

http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch15_:_Linux_FTP_Server_Setup#Introduction

http://www.mdjnet.dk/ftp.html

FTP Configuration in Windows Server 2008

http://learn.iis.net/page.aspx/309/configuring-ftp-firewall-settings/

FTP Configuration using cPanel

http://docs.cpanel.net/twiki/bin/view/AllDocumentation/CpanelDocs/FTPAccounts