从 ubuntu 客户端，我突然无法 sftp，这是详细输出：
sftp -vvv [email protected]
OpenSSH_7.2p2 Ubuntu-4ubuntu2.10, OpenSSL 1.0.2g 1 Mar 2016
debug2: resolving "test.com" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to test.com [159.83.131.165] port 22.
debug1: Connection established.
debug1: identity file /home/deploy/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/deploy/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/deploy/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/deploy/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/deploy/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/deploy/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/deploy/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/deploy/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.10
ssh_exchange_identification: Connection closed by remote host
Couldn't read packet: Connection reset by peer
我尝试过更新 hosts.allow 并更改超时时间，如其他帖子中所述，但似乎没有任何效果。以前这种方法效果很好。输出是否表明服务器停止接受当前可用的本地证书，我需要生成新的证书？如果是，有人能帮忙吗？如果没有，还有其他想法吗？
谢谢你的帮助，凯文