Online security and servers

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Online security and servers

Justin Ellingwood Introduction When setting up infrastructure, getting your applications up and running will often be your primary concern. However, making your applications to function correctly without addressing the security needs of your infrastructure could have devastating consequences down the line.

In this guide, we will talk about some basic security practices that are best to configure before or as you set up your applications. A private and public key pair are created prior to authentication. The private key is kept secret and secure by the user, while the public key can be shared with anyone.

When the user connects to the server, the server will ask for proof that the client has the associated private key. The SSH client will use the private key to respond in a way that proves ownership of the private key.

The server will then let the client connect without a password. To learn more about how SSH keys work, check out our article here. How Do They Enhance Security? With SSH, any kind of authentication, including password authentication, is completely encrypted.

Online security and servers

However, when password-based logins are allowed, malicious users can repeatedly attempt to access the server. With modern computing power, it is possible to gain entry to a server by automating these attempts and trying combination after combination until the right password is found.

Setting up SSH key authentication allows you to disable password-based authentication. SSH keys generally have many more bits of data than a password, meaning that there are significantly more possible combinations that an attacker would have to run through. Many SSH key algorithms are considered uncrackable by modern computing hardware simply because they would require too much time to run through possible matches.

How Difficult Is This to Implement? SSH keys are very easy to set up and are the recommended way to log into any Linux or Unix server environment remotely. A pair of SSH keys can be generated on your machine and you can transfer the public key to your servers within a few minutes.

To learn about how to set up keys, follow this guide.

Security and reliability

If you still feel that you need password authentication, consider implementing a solution like fail2ban on your servers to limit password guesses. Firewalls A firewall is a piece of software or hardware that controls what services are exposed to the network.

This means blocking or restricting access to every port except for those that should be publicly available. On a typical server, a number services may be running by default.

These can be categorized into the following groups: Public services that can be accessed by anyone on the internet, often anonymously. A good example of this is a web server that might allow access to your site.

79 Server Security Tips for You to Secure Your Server

Private services that should only be accessed by a select group of authorized accounts or from certain locations. An example of this may be a database control panel. Internal services that should be accessible only from within the server itself, without exposing the service to the outside world.

For example, this may be a database that only accepts local connections. Firewalls can ensure that access to your software is restricted according to the categories above. Public services can be left open and available to everyone and private services can be restricted based on different criteria.

Internal services can be made completely inaccessible to the outside world. For ports that are not being used, access is blocked entirely in most configurations. Firewalls are an essential part of any server configuration. A properly configured firewall will restrict access to everything except the specific services you need to remain open.

Exposing only a few pieces of software reduces the attack surface of your server, limiting the components that are vulnerable to exploitation. There are many firewalls available for Linux systems, some of which have a steeper learning curve than others.

A simple choice is the UFW firewall. Other options are to use iptables or the CSF firewall. VPNs and Private Networking Private networks are networks that are only available to certain servers or users. For example, DigitalOcean private networks enable isolated communication between servers in the same account or team within the same region.

A VPN, or virtual private network, is a way to create secure connections between remote computers and present the connection as if it were a local private network. This provides a way to configure your services as if they were on a private network and connect remote servers over secure connections.Need help finding the right equipment for your network?

Our experts are here to help! Email your project requirements to [email protected], or fill out our web form and we’ll get back to you with a few different options that would be a good fit for your network.

A secure server is a Web server that guarantees secure online transactions.

Need help finding the right equipment for your network?

Secure servers use the Secure Sockets Layer (SSL) protocol for data encryption and decryption to protect data from unauthorized interception. Server Security As part of the School of Medicine Security Initiative, we need accurate information about all devices that store Stanford data.

This includes both "endpoint" devices (laptops, desktops, mobile devices) and now, servers. Database server containing SUNet IDs only; Online maps that do not include sensitive information;. Just a few simple recommendations from our expert server administrators.


Secure your server with these 79 server security tips. From passwords to web-applications to sever level configuration, we have a huge list of tips to keep your system secure. Need help finding the right equipment for your network? Our experts are here to help! Email your project requirements to [email protected], or fill out our web form and we’ll get back to you with a few different options that would be a good fit for your network.

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