不幸的是我没有访问ssh服务器，我只能看到：
Platform: i586-pc-linux-gnu Compiled with: liblua-5.2.3 openssl-1.0.1k libpcre-8.35 libpcap-1.6.2 nmap-libdnet-1.12 ipv6 Compiled without: Available nsock engines: epoll poll select ssh -vvvl user ip debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: setup hmac-sha1 debug1: kex: server->client 3des-cbc hmac-sha1 none debug2: mac_setup: setup hmac-sha1 debug1: kex: client->server 3des-cbc hmac-sha1 none debug2: bits set: 502/1024 debug1: sending SSH2_MSG_KEXDH_INIT debug1: expecting SSH2_MSG_KEXDH_REPLY Connection closed by IP 你应该解决添加：
MACs=hmac-sha1 ssh -o MACs=hmac-sha1 -vvvl user ip