Tweaks. Going to bed now. Hope I haven't frakked up the tests

fs/sftpfs.py

@@ -141,7 +141,7 @@ class SFTPFS(FS):
             except paramiko.SSHException:
                 pass
         
-        if not connection.is_authenticated():
+        elif not connection.is_authenticated():
             if not username:
                 username = getuser()                
             try:                
@@ -158,16 +158,16 @@ class SFTPFS(FS):
                     try:                
                         connection.auth_none(username)
                     except paramiko.BadAuthenticationType, e:
-                        connection.close()
+                        self.close()
                         allowed = ', '.join(e.allowed_types)
                         raise RemoteConnectionError(msg='no auth - server requires one of the following: %s' % allowed, details=e)                                
                 
                 if not connection.is_authenticated():
-                    connection.close()
+                    self.close()                                                        
                     raise RemoteConnectionError(msg='no auth')
                 
             except paramiko.SSHException, e:
-                connection.close()
+                self.close()                                
                 raise RemoteConnectionError(msg='SSH exception (%s)' % str(e), details=e)
                 
         self._transport = connection