server responded algorithm negotiation failed

ssh报错：server responded "algorithm negotiation failed"

原因是SSH升级后，为了安全，默认不再采用原来的一些加密算法，需要手动添加

1、在/etc/ssh/sshd_config的结尾添加

Ciphers aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc
MACs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-sha1-96,hmac-md5-96
KexAlgorithms diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group1-sha1,curve25519-sha256@libssh.org

2、重启

systemctl restart sshd.service

3、开机自启：

systemctl enable sshd.service

4、查看启动状态

systemctl status sshd.service

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