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I have some experience about linux admin, this issue never happened when I use AWS EC2 or other VPS.

After I create centos7 vm on google cloud compute engine, I changed only one line of sshd_config file(uncomment Port 1234),then create an iptabels rule to allow ingress port 1234.

And also selinux disabled. Then I restart sshd service and stuck there forever. Connect to serial console, sshd -t no error shows, /usr/sbin/sshd -f /etc/ssh/sshd_config no error shows. Try /usr/sbin/sshd -D then sshd service start successfully and port 1234 can connected by PUTTY. Exit debug mode then sshd service cannot start again.

Is there any command I need to configure with google cloud console or something?

I'm kind of new to google cloud, so please help me with this strange issue.

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