The CentOS7sshd connection is rejected, and the port is changed to 2200.

The CentOS7sshd connection is rejected, and the port is changed to 2200.
1. The server cannot be connected.

Ssh: connect to host XXXXX port 22: Connection refused

Cause: centos7 changed the link port to 2200.

# Port 22

Modify it back or use the 2200 link.

Modify: vi/etc/ssh/sshd_config

2. The firewall is installed on centos7 by default instead of iptables.

Because it is a local test, you can directly disable the firewall and disable start-up.

Systemctl stop firewalld

Systemctl disable firewalld
3. Disable selinux.

Vi/etc/selinux/config