CentOS 7 sshd Connection denied, port changed to 2200, centossshd

CentOS 7 sshd Connection denied, port changed to 2200, centossshd
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
Port 2200

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

Modify the following content

# SELINUX = enforcing # comment out

# SELINUXTYPE = targeted # comment out

SELINUX = disabled # Add