买了个美国的 vps ，ssh 连接输入命令卡的要死，用这个命令尝试代理 ssh -o ProxyCommand="nc -X 5 -x 127.0.0.1:7891 %h %p" -p 443 root@host 一直报错 kex_exchange_identification: Connection closed by remote host Connection closed by UNKNOWN port 65535 求解
