In some cases, this can be caused by customizations that users have made to their Athena accounts; the most common case being when commands have been added to the ~/.cshrc.mine file that print text when logging in.
If you have customizations that cause your account to print text each time you log in, the printed text causes problems for the Dreamweaver SFTP connection such that the connection script identifies the server as being broken.
To enable Dreamweaver FTP (or similar programs) to work, you need to add a line to the top of your ~/.cshrc.mine file.
Add the following, exactly as shown, all on one line:
if ($?USER == 0 || $?prompt == 0) exit # exit, if non-interactive
This line ensures that the .cshrc.mine file does not run when you use Dreamweaver FTP.
If this does not solve the problem, contact the Computing Help Desk for further assistance.