- CENT OS 6 SSH HOW TO OPEN PORTS FOR STEAM GAMES UPDATE
- CENT OS 6 SSH HOW TO OPEN PORTS FOR STEAM GAMES SOFTWARE
Press the Esc key to return to command mode and enter :wq to write out the file and quit vi. Remove the # if present and change the port number to the required value. The Port line should be in the first page of the file, as either Port 22 or commented out as #Port 22. For example 2×1066 is 2132, so port 2132 can be remembered as Twice Battle of Hastings. 22 becomes 2222, but that is familiar to hackers so pick something else, e.g. Some admins just double up port numbers, e.g. See List of TCP and UDP Port Numbers on Wikipedia. Select a new port number above 1024, one that is meaningful to you so it is remembered, or pick a random one. Or if logged in as a user with sudo ability: $ sudo vi /etc/ssh/sshd_config Add the Required Port Number To edit sshd_config using vi: # vi /etc/ssh/sshd_config On a minimal CentOS install, typical for a VPS, nano will not be installed by default.
(For all commands in this article only enter the text after the # or $ prompt character, as seen on the terminal screen.)Įditing is done with vi or nano. Here's the command to copy sshd_config to sshd_cfg_old: # cp /etc/ssh/sshd_config /etc/ssh/sshd_cfg_old Before editing the /etc/ssh/sshd_config file take a copy in case anything goes wrong. To start the process to change the SSH port number, log into the server. This article uses the shell (command line terminal) to change the CentOS configuration, based on a minimal CentOS install. If SSH is the only option for configuration of a remote VPS consider other hardening options first, for example adding a sudo user for SSH login and removing the root user login over SSH. Always ensure you have a backup of any data that needs to be kept in the event the VPS needs to be reset. It will require resetting via your service provider's control panel. For a remote VPS if you make a mistake reconfiguring the SSH port you may not be able to connect to it. CentOS can be configured on a local Virtual Machine (VM) to practice these changes. This ensures familiarity with the process and reduces the risk of making mistakes on a live server. It is recommended to practice the detailed instructions that follow on a local test environment before doing it on a live machine.
CENT OS 6 SSH HOW TO OPEN PORTS FOR STEAM GAMES UPDATE
So if the OS won't give SSH a different port number on install, change it yourself. Instead operating system (OS) developers just stick to port 22 for SSH, making it easier for bots to try and brute force in. Why not randomise the port number? As long as the admin configuring the machine knows the port number then it can be given out on a need to know basis. For example nearly all systems use the default port 22 for the secure shell (SSH).
CENT OS 6 SSH HOW TO OPEN PORTS FOR STEAM GAMES SOFTWARE
Despite all the years of computer hacking software developers still keep to default settings. Reducing the Size of the Target for HackersĪs soon as a computer or device is connected to the Internet it becomes a target for bots or hackers trying to find weaknesses. If required you can practice on a local VM. Any changes that cause issues are your responsibility so only proceed if confident. (In which case a support call to the remote service provider may be required.) If in doubt leave the port at the default setting of 22. If SSH is your only access point then be very careful not to lock yourself out. If accessing a remote server the service provider will have connection details (e.g. This tutorial assumes that you can access the terminal for the CentOS server. This tutorial provides details on changing the SSH default port number for a CentOS server. CentOS and other Linux versions are a common option for a VPS operating system. For example when accessing a Virtual Private Server (VPS) to perform configuration changes. The Secure Shell (SSH) is used to access a CentOS Server from another computer.
Change SSH Port from Default for CentOS Security Improvement
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