我尝试了互联网上找到的不同的解决方案来解决这个问题，但没有成功：
- 密钥的正确权限为
/etc/ssh/，私钥 rsa 密钥为 400，公钥 rsa 密钥为 600。 /home/usersrv/.ssh/文件夹权限为 700。authorized_keys不存在。我后来用权限 600 创建了它；文件仍然是空的，我应该在里面复制一些东西吗？主目录与系统位于同一卷上。- 尝试了不同的端口：22 和 2222
服务器配置/etc/ssh/sshd_config未注释部分：
Port 2222
AddressFamily any
ListenAddress 0.0.0.0
ListenAddress ::
HostKey /etc/ssh/ssh_host_rsa_key
PermitRootLogin no
RSAAuthentication yes
PubkeyAuthentication yes
# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication no
PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with# some PAM modules and threads)
ChallengeResponseAuthentication no
KerberosAuthentication no
GSSAPIAuthentication no
UsePAM yes
X11Forwarding yes
X11UseLocalhost yes
PermitTTY yes
PrintMotd no
当我尝试从 Win+PuTTy 连接时，出现错误消息：没有可用的受支持的身份验证方法（服务器发送公钥）
/etc/ssh/sshd_config line 37: Deprecated option RSAAuthentication
debug1: sshd version OpenSSH_7.4, OpenSSL 1.0.2l 25 May 2017
debug1: private host key #0: ssh-rsa SHA256:F61cGX7XOyKpBMChyVtxyaH2T23NoIr9+iAKCjRAbO4
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-d'
debug1: Set /proc/self/oom_score_adj from 0 to -1000
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from 192.168.1.98 port 40922 on 192.168.1.98 port 22
debug1: Client protocol version 2.0; client software version OpenSSH_7.4p1 Debian-10+deb9u3
debug1: match: OpenSSH_7.4p1 Debian-10+deb9u3 pat OpenSSH* compat 0x04000000
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u3
debug1: Enabling compatibility mode for protocol 2.0
debug1: permanently_set_uid: 110/65534 [preauth]
debug1: list_hostkey_types: ssh-rsa,rsa-sha2-512,rsa-sha2-256 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: kex: algorithm: curve25519-sha256 [preauth]
debug1: kex: host key algorithm: rsa-sha2-512 [preauth]
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug1: rekey after 134217728 blocks [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: rekey after 134217728 blocks [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user usersrv service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
reprocess config line 37: Deprecated option RSAAuthentication
debug1: PAM: initializing for "usersrv"
debug1: PAM: setting PAM_RHOST to "192.168.1.98"
debug1: PAM: setting PAM_TTY to "ssh"
Connection closed by 192.168.1.98 port 40922 [preauth]
debug1: do_cleanup [preauth]
debug1: monitor_read_log: child log fd closed
debug1: do_cleanup
debug1: PAM: cleanup
debug1: Killing privsep child 941
debug1: audit_event: unhandled event 12
然后我尝试本地登录（直接在 usersrv 下），但出现错误：权限被拒绝（公钥）。
/etc/ssh/sshd_config line 37: Deprecated option RSAAuthentication
debug1: sshd version OpenSSH_7.4, OpenSSL 1.0.2l 25 May 2017
debug1: private host key #0: ssh-rsa SHA256:F61cGX7XOyKpBMChyVtxyaH2T23NoIr9+iAKCjRAbO4
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-d'
debug1: Set /proc/self/oom_score_adj from 0 to -1000
debug1: Bind to port 2222 on ::.
Server listening on :: port 2222.
debug1: Bind to port 2222 on 0.0.0.0.
Server listening on 0.0.0.0 port 2222.
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from 192.168.1.98 port 54596 on 192.168.1.98 port 2222
debug1: Client protocol version 2.0; client software version OpenSSH_7.4p1 Debian-10+deb9u3
debug1: match: OpenSSH_7.4p1 Debian-10+deb9u3 pat OpenSSH* compat 0x04000000
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u3
debug1: Enabling compatibility mode for protocol 2.0
debug1: permanently_set_uid: 110/65534 [preauth]
debug1: list_hostkey_types: ssh-rsa,rsa-sha2-512,rsa-sha2-256 [preauth]
debug1: SSH2_MSG_KEXINIT sent [preauth]
debug1: SSH2_MSG_KEXINIT received [preauth]
debug1: kex: algorithm: curve25519-sha256 [preauth]
debug1: kex: host key algorithm: rsa-sha2-512 [preauth]
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none [preauth]
debug1: expecting SSH2_MSG_KEX_ECDH_INIT [preauth]
debug1: rekey after 134217728 blocks [preauth]
debug1: SSH2_MSG_NEWKEYS sent [preauth]
debug1: expecting SSH2_MSG_NEWKEYS [preauth]
debug1: SSH2_MSG_NEWKEYS received [preauth]
debug1: rekey after 134217728 blocks [preauth]
debug1: KEX done [preauth]
debug1: userauth-request for user usersrv service ssh-connection method none [preauth]
debug1: attempt 0 failures 0 [preauth]
reprocess config line 37: Deprecated option RSAAuthentication
debug1: PAM: initializing for "usersrv"
debug1: PAM: setting PAM_RHOST to "192.168.1.98"
debug1: PAM: setting PAM_TTY to "ssh"
Connection closed by 192.168.1.98 port 54596 [preauth]
debug1: do_cleanup [preauth]
debug1: monitor_read_log: child log fd closed
debug1: do_cleanup
debug1: PAM: cleanup
debug1: Killing privsep child 1111
debug1: audit_event: unhandled event 12
有人遇到过同样的问题或知道解决办法吗？问候。
答案1
似乎你没有将计算机的公钥添加到服务器。客户端计算机的公钥存储在授权密钥文件。
将 /etc/ssh/sshd_config 中的此行更改为 yes （稍后您可以再将其改回来）
PasswordAuthentication yes
并重启ssh守护进程
sudo service ssh restart
然后从客户端计算机发出以下命令将公钥导出到服务器：
ssh-copy-id usersrv@server
在命令提示符中输入您的密码。之后您将通过 ssh-keys 访问您的服务器。