Ubuntu connect to server

On Ubuntu, one can easily connect to a server and download/upload file via SSH. First, one should open the connect to server window. This can be done by two ways.  Press Alt+F2 and search for "nautilus-connect-server", or open any folder by the file manager and use the menu File>Connect to server.  Both ways can open the connect to server window. In this window, at the Server address input box, type
ssh://username@serveraddress:port/folder
Here replace the username, serveraddress, port and folder with real ones. Then click connect to link to the server. After connection is established, one can mange files in server just like those in local folders. Note the ":port"part is optional.