authentication
Click on the red underlined text to get to the source
... SASL. For example,
a manager may connect to a proxy, authenticate herself with SASL,
then instruct the proxy ...
... 504 Parameter not implemented
530 Authentication required
534 Authentication mechanism ...
... Authentication required
534 Authentication mechanism insufficient
(E.g., too weak, sequence exhausted, etc.)
...
... BEEP. In BEEP, transport
security, user authentication, and data exchange are orthogonal.
Refer to Section 8 of [2 ...