I manage a corporate FTP site whose outbound code is using Net::FTP and roboticus is dead on. Net::FTP doesn't lie. If it says access denied there is an access error. In other words, you don't have permission to put the file where you are trying to put it. So, check where you are when you try 'put'. Have your code fetch and print the remote directory you are in. Also, doing the transfer manually will also give you some insight into how your transfer is failing.