1. Log in to the Centos6.4 system.

◆ Example: Log in as root user.

Note: If you log in as a non-root user, you need to add sudo if you don't have enough rights to execute some lives.

2. Check whether SSH is installed.

◆ Enter the command: rpm-QA | grepsh.

Note: If SSH is not installed, you can enter: Yuminstallopensh-server installation.

3. Start the SSH service.

◆ Enter the command: servicesshdrestart to restart the SSH service.

Command: servicesshdstart starts the service | Command: servicesshdstop stops the service.

After restarting, you can enter: netstat-antp | grepshd to see if port 22 is started (omitted).

4. How to set SSH service startup?

◆ Enter the command: chkconfigsshdon.

Note: If chkconfigsshdoff, SSH startup is prohibited.

5. Remote access to Centos6.4 system.

◆ You can connect SSH service remotely by using putty and SecureCRT under Windows.

Directly use the command under ◆Linux: sship (for example: ssh192.168.1.11).

Does ssh use tcp79 port?

No, ssh uses port 22.

How to configure SSH under Linux system? How to turn on SSH?

1, how to check the linux operating system version?

Open the command line of the linux terminal and enter the following command. Lsb _ release-a. The server is a physical machine and the operating system is redhat6.7, as shown in the figure below.

2. How to check whether the SSH service is installed?

Execute at the terminal command line. Rpm-QA | grep "ssh". See the figure below for the implementation result, indicating that it has been installed; In fact, it will be installed by default when installing the linux operating system.

3. What if SSH service is not installed?

Find the operating system image file to be decompressed, find the ssh related package and upload it to the server. Then execute the following installation command to install. Rpm-ivhrpm package name. If the server has an image installed, you can use the following command to install it directly. Yuminstallssh. Here, because my linux server has installed SSH, I won't do the installation operation.

4. How to start the SSH service?

Start command, servicesshdstart. Stop command, service stop. Restart command. First, let's see if the SSH service is started. Please execute the following command servicesshdstatus. If you want to restart, you can execute the restart command servicesshdrestart. See the figure below for the specific implementation.

5. How to check what the SSH port is?

Execute the following command, more/etc/ssh/sshd_config. You can look at the description. The default port is 22, as shown in the figure below. In addition, the port can be modified.

6. There are two ways to configure and start the SSH service.

1. Close the firewall and execute the following command serviceiptablesstop.

2. Just open port 22, vi/etc/sysconfig/iptables, and add this line to the iptables file,-a input-mstate-state new-mtcp-ptcp-d port22-j accept. Please refer to the operation shown in the figure below.

How to configure ssh client and how to connect to Linux server through ssh?

Open the remote control and port on the Linuxe server. Intranets can be directly connected with addresses and ports. External network needs to do port mapping.

1. Start the ssh(secureshell) service (mine is linuxubuntu 10. 10). Of course, before starting the ssh service, you need to download the relevant software. Use the following command: sudoapt-getinstallssh, then enter /etc/init.d, and enter the command: sudoservicesshstart to open the ssh service. Use netstat-tln to check whether the ssh service is turned on (ssh service uses 22 ports by default). To turn off the ssh service, use: sudoservicesshstop to turn off the ssh service.

2. Download the ssh client putty in the client (widnows host), fill in the linux server ip, sessionname, save it, open it, enter the user name and password, and log in successfully.

Ssh protocol port number?

The default port used by SSH service is TCPPort22. Transmission Control Protocol (TCP) is a transport protocol, which is specially used to provide reliable end-to-end byte streams on unreliable Internet. The Internet is very different from a single network because different parts of the Internet may have completely different topologies, bandwidths, delays, packet sizes and other parameters.