Create more secure remote access - learn Linux SSHD configuration

With the continuous development of Internet technology, remote access has become an indispensable part of people's work and life. However, security issues have always been one of the main challenges faced by remote access. In Linux systems, SSH (Secure Shell) is a widely used remote login protocol, providing a more secure and reliable remote access method. This article will introduce how to configure the SSHD service in Linux systems to achieve more efficient and secure remote access.

1. First modify the configuration file

vi /etc/ssh/sshd_config

Find the #Port 22 section. Here is the default port 22 used by the logo. Modify it as follows:

Port 22 Port 50000 Then save and exit

Service restart takes effect.

/etc/init.d/sshd restart

In this way, SSH ports 22 and 50000 are available at the same time.

2. Configure the access policy of the firewall:

 vi /etc/sysconfig/iptables

Enable port 50000.

Firewall restart:

/etc/init.d/iptables restart

Now please use the ssh tool to connect to port 50000 to test whether it is successful. If the connection is successful, edit the sshd_config settings again and delete Port22 in it.

In Linux systems, the SSHD service is a very important service, which provides a more secure and reliable remote access method. Through the introduction of this article, we have learned how to configure the SSHD service, including user authentication, restricted login, etc., thus improving the security and stability of the system. At the same time, some common SSH client commands are also introduced to help us better understand how to use SSH. Configuring the SSHD service is not a simple matter and requires in-depth knowledge of system and network security, but doing so will make our remote access more convenient and secure.

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