What should I do if the centos system cannot connect remotely?

The solution is as follows:

1. Check whether the firewall is turned off

  service iptables status

You can temporarily turn off the firewall through the following command, or you can turn off the firewall permanently.

/etc/init.d/iptables stop 
service iptables stop 
chkconfig iptables off #（永久关闭）

(Recommended tutorial: centos usage tutorial)

2. Check whether sshd is installed

rpm -qa |grep sshd

View Whether to run

#If sshd is not installed, use the following command to install it.

yum install openssh-server

Related video tutorial recommendations: linux video tutorial

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