For more detailed information, look at the FTP log.
#Webdav server not found external code
Be sure to indicate the remote system’s root folder as the host directory. For a Dreamweaver FTP implementation, you must connect to the remote system’s root folder.If you encounter problems with FTP access, ask your local system administrator for help.
The Dreamweaver FTP implementation might not work properly with certain proxy servers, multilevel firewalls, and other forms of indirect server access.