解决debian11 ubuntu20等使用securecrt winscp无法连接问题

出现错误

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

解决方法

问题分析，新系统加密验证方式旧版本ssh客户端软件不支持，进行修改即可。
vi /etc/ssh/sshd_config在最下方空白输入

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

之后重启ssh服务
sudo service ssh restart