ssh登錄緩慢，使用ssh -v登錄后，顯示在 “pledge: network” 處卡頓：

當登錄一台服務器時，每次輸入密碼之后都要等很久才會得到命令提示符，嘗試修改了sshd_config中的UseDNS no，但效果依然不好。

ssh -v 192.168.12.43

This is probably an issue with D-Bus and systemd. If the dbus service is restarted for some reason, you will also need to restart systemd-logind.
You can check if this is the issue by opening the ssh daemon log (on Ubuntu it should be /var/log/auth.log) and check if it has these lines:
注：CentOS 下查看 

 

cat /var/log/secure

sshd[2721]: pam_systemd(sshd:session): Failed to create session: Connection timed out
如果找到以上信息，則在服務端執行:

systemctl restart systemd-logind

 

完美解決！！