ssh connection refused
ssh: connect to host localhost port 22: Connection refused
问题
在使用ssh连接时出现:
$ ssh localhost
ssh: connect to host localhost port 22: Connection refused
分析
SSH是否开启,端口是否监听
检查端口是否监听
$ ss -tnlp
State Recv-Q Send-Q Local Address:Port Peer Address:Port
从命令结果可以看到,SSH的监听端口(22)并没有
检查sshd.service服务是否开启
$ systemctl status sshd.service
● sshd.service - OpenSSH Daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; disabled; vendor preset: disabled)
Active: inactive (dead)
sshd.service没有没有激活
原因
ssh服务没有启动,端口未处于监听状态
解决
$ systemctl start sshd.service
$ systemctl status sshd.service
● sshd.service - OpenSSH Daemon
Loaded: loaded (/usr/lib/systemd/system/sshd.service; disabled; vendor preset: disabled)
Active: active (running) since Sun 2018-04-22 23:51:43 CST; 6s ago
Main PID: 9429 (sshd)
Tasks: 1 (limit: 4915)
Memory: 1.7M
CGroup: /system.slice/sshd.service
└─9429 /usr/bin/sshd -D
4月 22 23:51:43 xiaoliu-manjaro systemd[1]: Started OpenSSH Daemon.
4月 22 23:51:43 xiaoliu-manjaro sshd[9429]: Server listening on 0.0.0.0 port 22.
4月 22 23:51:43 xiaoliu-manjaro sshd[9429]: Server listening on :: port 22.
$ ss -tmlp
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 128 0.0.0.0:ssh 0.0.0.0:*
skmem:(r0,rb87380,t0,tb16384,f0,w0,o0,bl0,d0)
LISTEN 0 128 [::]:ssh [::]:*
skmem:(r0,rb87380,t0,tb16384,f0,w0,o0,bl0,d0)
$ ssh localhost
Last login: Sun Apr 22 17:22:36 2018 from ::1
附录
命令
ss -tnlp
systemctl status sshd.service
systemctl start sshd.service
ssh localhost
参考
- ArchWiki中Secure Shell章节: https://wiki.archlinux.org/index.php/OpenSSH