What if you try http://wordpress.org/extend/plugins/ssh-sftp-updater-support/ ? If that doesn’t work you can do a quick code change to get the logs with which the developer of that plugin can use do more diagnostics.
What if you try http://wordpress.org/extend/plugins/ssh-sftp-updater-support/ ? If that doesn’t work you can do a quick code change to get the logs with which the developer of that plugin can use do more diagnostics.