报错信息：
Key exchange failed.
No compatible key exchange method. The server supports these methods: curve25519-sha256,
[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256
原因：
当前操作系统安装的openssh版本较新，默认屏蔽了不安全的密钥交换算法
解决方案：
编辑/etc/ssh/sshd_config配置文件，添加如下内容
KexAlgorithms
[email protected],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
保存后重启sshd服务 systemctl restart sshd 或 service sshd restart 或 kill -9 xxx; /usr/sbin/sshd
查看sshd Key exchange配置：
# sshd -T
kexalgorithms
[email protected],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
casignaturealgorithms ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,
[email protected],ssh-ed25519,
[email protected],rsa-sha2-512,rsa-sha2-256
# ssh -Q kex
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
diffie-hellman-group14-sha256
diffie-hellman-group16-sha512
diffie-hellman-group18-sha512
diffie-hellman-group-exchange-sha1
diffie-hellman-group-exchange-sha256
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521
curve25519-sha256
[email protected]
[email protected]
参考：
https://stackoverflow.com/questions/48643291/change-kexalgorithms-on-openssh
https://stackoverflow.com/questions/32686530/whats-openssh-default-kexalgorithms
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原文链接：
https://blog.csdn.net/carefree2005/article/details/112981217
[
本帖最后由 linda 于 2021-3-8 11:44 编辑 ]
[
本帖最后由 linda 于 2021-3-8 11:50 编辑 ]
