服務器升級openssh之后jenkins構建報錯了，報錯信息如下：
Failed to connet or change directory
jenkins.plugins.publish_over.BapPublisherException:Failed to connect session for config.....Message [Algorithm negotiation fail]
升級前ssh版本：OpenSSH_5.3p1
升級后sshl版本：OpenSSH_6.8pl
解決辦法：
修改/etc/ssh/sshd_config配置文件，在最后添加如下內容：
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,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group1-sha1,curve25519-sha256@libssh.org
重啟sshd服務后，問題解決。