ssh: connect to host localhost port 22: Connection refused : 通过系统日志排查问题

最新推荐文章于 2025-03-09 17:58:06 发布

Neetgo

最新推荐文章于 2025-03-09 17:58:06 发布

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本文记录了一次SSH连接失败的问题排查过程。从配置SSH免密登录到遇到连接被拒绝的情况，通过检查防火墙状态、查看系统日志，最终定位到配置文件错误并解决。

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1. 配置好了ssh免登录，但登录的时候却报拒绝连接

[hadoop@hadoop1 Desktop]$ ssh localhost
ssh: connect to host localhost port 22: Connection refused

2. 检查防火墙，防火墙已关闭

[hadoop@hadoop1 Desktop]$ systemctl status iptables.service 
iptables.service - IPv4 firewall with iptables
   Loaded: loaded (/usr/lib/systemd/system/iptables.service; disabled)
   Active: inactive (dead)

3. 查看系统日志，发现原来是配置问题

[hadoop@hadoop1 Desktop]$ sudo tail /var/log/messages
[sudo] password for hadoop: 
Aug 22 02:41:54 hadoop1 systemd: fprintd.service: main process exited, code=exited, status=157/n/a
Aug 22 02:41:54 hadoop1 systemd: Unit fprintd.service entered failed state.
Aug 22 02:41:55 hadoop1 systemd: sshd.service holdoff time over, scheduling restart.
Aug 22 02:41:55 hadoop1 systemd: Stopping OpenSSH server daemon...
Aug 22 02:41:55 hadoop1 systemd: Starting OpenSSH server daemon...
Aug 22 02:41:55 hadoop1 systemd: Started OpenSSH server daemon.
Aug 22 02:41:55 hadoop1 sshd: /etc/ssh/sshd_config: line 158: Bad configuration option: sshd:All
Aug 22 02:41:55 hadoop1 sshd: /etc/ssh/sshd_config: terminating, 1 bad configuration options
Aug 22 02:41:55 hadoop1 systemd: sshd.service: main process exited, code=exited, status=255/n/a
Aug 22 02:41:55 hadoop1 systemd: Unit sshd.service entered failed state.
[hadoop@hadoop1 Desktop]$

4. 改正配置文件，搞定。