Shulou(Shulou.com)06/01 Report--

This article is about how linux securely strengthens SSH. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Security enhanced SSH

Next, make the following three changes:

Disable SSH password authentication

Restrict root remote login

Restrict access to IPv4 or IPv6

Open / etc/ssh/sshd_config using the text editor of your choice and make sure the following lines:

PasswordAuthentication yesPermitRootLogin yes

Change it to this:

PasswordAuthentication noPermitRootLogin no

Next, restrict the SSH service to IPv4 or IPv6 by modifying the AddressFamily option. To change it to use only IPv4 (which should be fine for most people), make the following changes:

AddressFamily inet

Restart the SSH service to enable your changes. Note that it is a good idea to establish two active connections to the server before restarting the SSH service. With these additional connections, you can fix all problems in the event of an error in restarting the SSH service.

On Ubuntu:

$sudo service sshd restart

On Fedora or CentOS or any system that uses Systemd:

$sudo systemctl restart sshd Thank you for your reading! This is the end of the article on "how linux securely strengthens SSH". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.