In part 4. the line cli_wallet -s wss://node.steem.ws/ gives me an error message

0 exception: unspecified
Timer Expired {"message":"Timer Expired"} asio websocket.cpp:513 operator()

{"uri":"wss://node.steem.ws/"}
th_a  websocket.cpp:699 secure_connect

{"uri":"wss://node.steem.ws/"}
th_a  websocket.cpp:673 connect

``

is wss://node.steem.ws/ down?