SecureCRT SSH连接报错Key exchange failed 问题处理记录

SecureCRT连接服务器时报错，报错信息为：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,

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24775人浏览 · 2021-05-14 16:09:17

feverlook · 2021-05-14 16:09:17 发布

SecureCRT连接服务器时报错，报错信息为：

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

1、原因分析
错误原因是SecureCRT 7.0客户端支持的和kali作为ssh服务端支持的SSH秘钥交换算法不匹配。
Secure CRT 7.0的默认支持key exchange算法：
2、解决方法有以下两种

第一种：升级SecureCRT为最新版，或者使用其他连接工具
第二种：修改服务器，使其兼容老系统的算法

vi /etc/ssh/sshd_config
#加入下面的文本  
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
systemctl restart sshd.service