Just to update anyone reading this, who were having issues connecting. Some users reported they couldn't log in or files were failing to download.
This is caused by
a connection limit on the server which states you can only have 'X' connections to the server. Most FTP Clients allow a user to queue up files and download 3 - 5 files at any one time. This was causing issues with our servers limit which was set to
3 connections per user. If you was browsing the FTP Server and downloading 2 files this means you have 3 connections active. Upon your FTP Client attempting to download another file (as well as your current 2 active transfers) your FTP Client will throw a connection issue or a incorrect password error (error 530) due to the server enforcing a max of 3 active connections. These files then tend to get classed as failed.
I have altered the setting on the server to hopefully make it little easier but if you want to make sure you don't hit this limit and cause issues please go into your FTP Client and set max connections to 3. This will set your FTP Client to only use a max of 3 Connections and so never hitting the limit.Hope this makes sense....
(tweaked this a little to stress the limit -Yoc)