使用ssh连接报错：Key exchange failed. No compatible key exchange method.
Tags： Key exchange failedLinuxOSssh连接问题
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现象
用SecureCRT 6.6.1连接报错：
Key exchange failed.
No compatible key exchange method. The server supports these methods: curve25519-sha256,curve25519-sha256@libssh.org,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
No compatible hostkey. The server supports these methods: rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
用Xshell 4连接报错：
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解决
在/etc/ssh/sshd_config文件中添加
1 2 3 4 5 6 7 8 | cat >> /etc/ssh/sshd_config <<"EOF" 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 EOF -- 或 cat >> /etc/ssh/sshd_config <<"EOF" 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,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519,curve25519-sha256,curve25519-sha256@libssh.org,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 EOF |
保存后，然后重启ssh服务
1 | systemctl restart sshd |
若还是不能解决，那么只能更新XSHELL的版本到6或7.
更新SecureCRT的版本到最高版本。
