问题解决:https://www.cnblogs.com/xjcn/p/13470254.html
/etc/ssh/sshd_config 最后一行写上:
KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1
重启ssh服务
CRT直连ok完成