FTP error occured contact admin

Hi

for no obvious reason all my sites are throwing ftp connection errors from and all of sudden. Ive checked connections to the same servers using other FTP applications successfully. Im using SFTP and Im also able to log in via SHH. It does appear the issue is DW related. Ive deleted ssh_log file from configuration folder, still gives errors. 

It doesnt even seem to check server response as the error dialogue box appears as soon as you hit the connect button,

Any assistance kindly welcomed.