What is server security hardening?

It is the work of reducing how a server can be attacked. In practice that means closing ports nothing needs, allowing only key-based SSH, installing security patches automatically, configuring TLS properly, restricting databases to known addresses and giving each person and service the least access it needs. The goal is fewer ways in and clear records of who can do what.

What does a Linux server hardening checklist include?

Our baseline covers SSH settings, firewall rules, automatic security updates, user and sudo accounts, file permissions on keys and secrets, listening services, database binding and authentication, TLS and web server headers, brute-force protection and logging. We use the CIS Benchmarks and a Lynis scan as references, then adjust to what your applications actually need.

Will hardening break our application or lock us out?

It should not, and we plan for it. We test changes on staging first, apply production changes in small batches and keep a second session open while changing SSH or firewall rules. Where a change could affect users, such as disabling password logins, we agree the timing with you and make sure everyone has a working key first.

Should SSH be open to the internet at all?

Usually not. We prefer SSH reachable only from a private network such as Tailscale, or from a short list of fixed office or VPN addresses. When it must stay public, we allow keys only, disable root login and add fail2ban. Changing the SSH port reduces log noise but is not a security control on its own.

Can you harden servers on AWS or Azure as well as our own hardware?

Yes. On AWS and Azure we harden the operating system and also review security groups, network security groups, public IP addresses and how admin access works. On your own hardware or a VPS we do the same at the host level. The approach is the same; only the cloud-side controls differ.

How is server hardening priced?

A hardening project is quoted at a fixed price after a short review, based on the number of servers, what runs on them and whether a staging copy exists. Ongoing maintenance is a fixed monthly retainer sized by the number of servers and the support hours you need. Tell us about your setup and we will send an estimate.

Does hardening make us compliant with security standards?

Hardening is one part of compliance, not the whole of it. We can map what we did against the CIS Benchmarks and document access controls, patching and logging so your auditors or compliance team have evidence to work with. Whether you meet a particular standard depends on your wider policies and processes, which we do not certify.

How often should a hardened server be reviewed?

Security patches should install continuously, with kernel reboots planned at least monthly. Access lists should be reviewed whenever someone joins or leaves and at least every quarter. We suggest a full rescan after any major change or operating system upgrade, because new packages and services can quietly reopen what was closed.

Infigini IT Services · Dehradun, India

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Infigini designs, builds and operates custom software for universities, healthcare providers and enterprises. Our work ranges from ERP platforms and AI knowledge assistants to the cloud infrastructure they run on.

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Nine disciplines, one engineering team.

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A written architecture before any code is written.

The technologies we use, organised by layer.

IT systems that organisations depend on every day.

Our values

The sectors we work in.

Services built around your operations.

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Specific services

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