问题 1：
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,[email protected],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
解答：
vi /etc/ssh/sshd_config
#add the following text
[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
#restart ssh
systemctl restart sshd.service
问题 2：
Key exchange failed. No compatible hostkey. The server supports these methods: rsa-sha2-512,rsa-sha2
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解决方法：
https://blog.csdn.net/weixin_42804852/article/details/123677678