标题: SecureCRT登录高版本Linux出错Key exchange failed的解决办法 [打印本页]

---

作者: linda    时间: 2017-12-18 12:08     标题: SecureCRT登录高版本Linux出错Key exchange failed的解决办法

新安装的Ubuntu20.04，SSH服务已安装，使用putty可以正常ssh远程登录进去，使用SecureCRT远程登录会报错如下：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,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256

解决办法：
1）在/etc/ssh/sshd_config文件中添加
KexAlgorithms [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

2）fedora 34 还需要注释掉 #Include /etc/ssh/sshd_config.d/*.conf
# cat /etc/crypto-policies/back-ends/opensshserver.config
Ciphers [email protected],[email protected],aes256-ctr,[email protected],aes128-ctr
MACs [email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha1,[email protected],hmac-sha2-512
GSSAPIKexAlgorithms gss-curve25519-sha256-,gss-nistp256-sha256-,gss-group14-sha256-,gss-group16-sha512-
KexAlgorithms curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512
HostKeyAlgorithms ecdsa-sha2-nistp256,[email protected],[email protected],[email protected],ecdsa-sha2-nistp384,[email protected],ecdsa-sha2-nistp521,[email protected],ssh-ed25519,[email protected],[email protected],[email protected],rsa-sha2-256,[email protected],rsa-sha2-512,[email protected]
PubkeyAcceptedKeyTypes ecdsa-sha2-nistp256,[email protected],[email protected],[email protected],ecdsa-sha2-nistp384,[email protected],ecdsa-sha2-nistp521,[email protected],ssh-ed25519,[email protected],[email protected],[email protected],rsa-sha2-256,[email protected],rsa-sha2-512,[email protected]
CASignatureAlgorithms ecdsa-sha2-nistp256,[email protected],ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,[email protected],rsa-sha2-256,rsa-sha2-512

重启sshd生效：
systemctl restart sshd

Ciphers [email protected],[email protected],[email protected],aes256-ctr,aes192-ctr,aes128-ctr
MACs [email protected],[email protected],[email protected],hmac-sha2-512,hmac-sha2-256,[email protected]

参考: https://stribika.github.io/2015/01/04/secure-secure-shell.html

[ 本帖最后由 linda 于 2021-7-19 19:35 编辑 ]

---

欢迎光临 中神通公司技术论坛 (http://trustcomputing.com.cn/bbs/)

Powered by Discuz! 6.0.0