When someone tries to connect to my ftp server using internet explorer it times out with 'getting contents of folder'
using the ftp command from dos doesn't show any problems (proftpd asks for username and password and allows the user to log in and use any available ftp commands). Only change that has been made since the time it worked is putting the ftpserver behind a linksys router. From the router, ports 20 and 21(tcp and udp) are forwarded to the ftpserver.
The proftp logs show successful connections and nothing more.