Key exchange failed.No compatible key exchange method.

使用远程工具secureCRT (版本：Version 7.0.0 (x64 build 326) ) 连接Linux（Ubuntu-22.04）系统

若20之前的ubuntu系统版本参考：：         🔗使用远程工具连接Linux系统

1、检查ssh-server版本

sudo dpkg -l | grep ssh

打印返回

ii  libssh-4:amd64                             0.9.6-2ubuntu0.22.04.3                  amd64        tiny C SSH library (OpenSSL flavor)
ii  libssh-gcrypt-4:amd64                      0.9.6-2ubuntu0.22.04.3                  amd64        tiny C SSH library (gcrypt flavor)
ii  openssh-client                             1:8.9p1-3ubuntu0.6                      amd64        secure shell (SSH) client, for secure access to remote machines
ii  openssh-server                             1:8.9p1-3ubuntu0.6                      amd64        secure shell (SSH) server, for secure access from remote machines
ii  openssh-sftp-server                        1:8.9p1-3ubuntu0.6                      amd64        secure shell (SSH) sftp server module, for SFTP access from remote machines
ii  python3-paramiko                           2.9.3-0ubuntu1.2                        all          Make ssh v2 connections (Python 3)
ii  ssh-import-id                              5.11-0ubuntu1                           all          securely retrieve an SSH public key and install it locally

Tip：若查询结果没有openssh-server，执行apt install -y openssh-server

2、连接报错

Key exchange failed. No compatible key exchange method. The server supports these methods: curve25519-sha256,[e-mail],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,[e-mail],diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,[e-mail] No compatible hostkey. The server supports these methods: rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519

报错说： 密钥交换失败。没有兼容的密钥交换方法。列举以下的方法 那就来添加交换密钥的方法

解决方法

vim /etc/ssh/sshd_config

在尾行输入以下内容

HostKeyAlgorithms=+ssh-rsa,ssh-dss
KexAlgorithms=+diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

然后Esc键，输入:wq保存退出，输入以下命令，重启ssh服务

systemctl restart sshd.service

或

service ssh restart

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