發(fā)行版及版本號：
debian:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 8.6 (jessie)
Release: 8.6
Codename: jessie
通過 apt-get install -y openssh-server 命令安裝了sshd母蛛，并修改配置文件使root用戶可以通過密碼登錄
debian:~# sed -i 's/PermitRootLogin without-password/PermitRootLogin yes/g' /etc/ssh/sshd_config
debian:~# systemctl restart ssh.service
使用SecureCRT 7.x可以登錄械巡，但是ssh secure shell client不能登錄，提示如下：
ssh client 提示：Server responded"Algorithm negotiation failed"
Key exchange with the remote host failed. This can happen for example computer does not support the selected algorthms.
通過網(wǎng)絡(luò)搜索得知官还，openssh升級后谜酒，刪除了一些舊的加密算法，所有導(dǎo)致部分ssh clients不能登錄妻枕。根據(jù)網(wǎng)友的分享僻族，我將這些加密算法添加到sshd_config，然后重啟啟動sshd屡谐。
debian:~# cat << EOF >>/etc/ssh/sshd_config
# there are old encryption algorithms
Ciphers aes128-cbc,aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr,3des-cbc,arcfour128,arcfour256,arcfour,blowfish-cbc,cast128-cbc
MACs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-sha1-96,hmac-md5-96
KexAlgorithms diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdg
EOF
debian:~# systemctl restart ssh.service
然后檢查ssh secure shell client述么，已經(jīng)成功登錄了。
