我有一台 Debian 8 服务器，但几天前，我的服务器提供商显示 SSh 已禁用，但仍可 ping，并且 HTTP/HTTPS 已启用。我必须补充一点，我是这个服务器领域的新手，我只知道基础知识，但其他的就不多了
我记得最后接触的是 sshd_config 文件，但我把所有东西都恢复到了原来的状态（与我的另一台服务器仔细检查了一下，确认我没有接触过）
因此，当我将服务器置于救援模式时，我
grep 'sshd' /var/log/auth.log
我得到以下信息：
Aug 17 12:23:44 vpsxxxxxx sshd[7974]: pam_unix(sshd:session): session opened for user root by (uid=0)
Aug 17 12:23:44 vpsxxxxxx sshd[7974]: Received disconnect from yy.yy.yy.yy: 11: disconnected by user
Aug 17 12:23:44 vpsxxxxxx sshd[7974]: pam_unix(sshd:session): session closed for user root
Aug 17 12:26:28 vpsxxxxxx sshd[7979]: error: Could not load host key: /etc/ssh/ssh_host_ed25519_key
Aug 17 12:26:28 vpsxxxxxx sshd[7979]: Connection closed by xx.xx.xx.xx [preauth]
Aug 17 12:26:52 vpsxxxxxx sshd[7981]: error: Could not load host key: /etc/ssh/ssh_host_ed25519_key
Aug 17 12:26:58 vpsxxxxxx sshd[7981]: Accepted password for root from xx.xx.xx.xx port 65429 ssh2
Aug 17 12:26:58 vpsxxxxxx sshd[7981]: pam_unix(sshd:session): session opened for user root by (uid=0)
我尝试过的解决方案可能超过 2 个：运行ssh-keygen -A、清除 openssh-server 并重新安装它，但都不起作用：关于加载失败的相同密钥的相同错误不断出现，并且当我尝试登录时我的连接仍然被拒绝。
我还可以尝试什么？
编辑
以下是的输出ssh -v root@vpsxxxxxx：
OpenSSH_6.6.1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 56: Applying options for *
debug1: Connecting to vps308451.ovh.net [137.74.194.226] port 22.
debug1: connect to address 137.74.194.226 port 22: Connection refused
ssh: connect to host vps308451.ovh.net port 22: Connection refused
请不要告诉我这是一个语法/人为错误......
編輯2
完全忘记了另外两个问题，抱歉
我的文件HostKey /etc/ssh/ssh_host_ed25519_key中确实有该行，并且/etc/ssh/ 目录输出以下内容：sshd_configls -la
drwxr-xr-x 2 root root 4096 Aug 17 13:44 .
drwxr-xr-x 88 root root 4096 Aug 17 13:28 ..
-rw-r--r-- 1 root root 242091 Jul 22 2016 moduli
-rw-r--r-- 1 root root 1704 Aug 17 13:27 ssh_config
-rw-r--r-- 1 root root 2528 Jun 20 08:29 sshd_config
-rw------- 1 root root 672 Aug 17 13:27 ssh_host_dsa_key
-rw-r--r-- 1 root root 604 Aug 17 13:27 ssh_host_dsa_key.pub
-rw------- 1 root root 227 Aug 17 13:27 ssh_host_ecdsa_key
-rw-r--r-- 1 root root 176 Aug 17 13:27 ssh_host_ecdsa_key.pub
-rw------- 1 root root 411 Aug 17 13:44 ssh_host_ed25519_key
-rw-r--r-- 1 root root 97 Aug 17 13:44 ssh_host_ed25519_key.pub
-rw------- 1 root root 980 Aug 17 13:44 ssh_host_key
-rw-r--r-- 1 root root 645 Aug 17 13:44 ssh_host_key.pub
-rw------- 1 root root 1675 Aug 17 13:27 ssh_host_rsa_key
-rw-r--r-- 1 root root 396 Aug 17 13:27 ssh_host_rsa_key.pub
但是我必须报告一些事情，当我进入文件夹执行“ls -la”时，ssh_host_ed25519_key 文件不存在（我重新创建了它，keygen-ssh -A但是几个小时前我已经尝试过了，但没有成功）
至于权限，我不知道输出是好还是坏......
編輯2
root@rescue-pro:/etc/ssh# ps -auwx | grep ssh
root 868 0.0 0.2 55184 5460 ? Ss 13:27 0:00 /usr/sbin/sshd -D
root 7982 0.0 0.2 82680 5860 ? Ss 13:33 0:00 sshd: root@pts/0
root 8009 0.0 0.1 13208 2160 pts/0 S+ 13:55 0:00 grep ssh
编辑3
root@rescue-pro:/home# netstat -lntp | grep sshd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 868/sshd
tcp6 0 0 :::22 :::* LISTEN 868/sshd
编辑 4：sshd_config 文件
# Package generated configuration file
# See the sshd_config(5) manpage for details
# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes
# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 1024
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile %h/.ssh/authorized_keys
# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no
# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes
# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no
#MaxStartups 10:30:60
#Banner /etc/issue.net
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
你们是我格式化/重新安装所有文件之前的最后希望
答案1
您可能需要发布sshd_config文件的内容。此外，您是否已将密钥复制到上述用户帐户目录中这里？