Server protection and hardening
What does server hardening mean?
A freshly installed host is open: it runs a few services nobody needs, password login still works, the firewall is permissive and logging is shallow. That default state can survive for years — until someone finds it. And today it is not a person who finds it, it is software.
Hardening replaces that default state. It is not a single setting but a series of layers: each one is an obstacle on its own, and together they make an attack disproportionately expensive.
What exactly do we do?
| Layer | What we do | What it protects against |
|---|---|---|
| Access | Key-based SSH, password login disabled, admin ports restricted | Brute force and leaked passwords |
| Firewall | Deny-by-default rule set, only the required ports, rate limiting | Port scanning, service exhaustion |
| Services | Unnecessary packages and daemons removed, privileges narrowed | The size of the attack surface |
| Kernel | Kernel-level hardening, mandatory access control | Privilege escalation through a known bug |
| Detection | Intrusion detection (IDS/IPS), file integrity monitoring | Quiet, long-term presence |
| Updates | Automated security updates with a controlled reboot schedule | Already known, already patched flaws |
| Logging | Central, searchable logging with an alerting chain | Being able to investigate after an incident |
How do I know I need this?
A few signs that usually justify a look at the host:
- the server still accepts password login, and you cannot say who has access;
- no updates have run for months — or they run, but nobody reads what happened;
- old test or development environments sit on the same machine as the live site;
- there was a “the server is slow” period that turned out not to be caused by traffic;
- you do not know where the logs are or how long they are kept.
How does the work run?
- Assessment. We look at the machine from the outside and the inside: open ports, running services, versions, access, logging. This part is free, and you get a summary of what we found.
- Plan. A prioritised list: what is critical, what is important, what can wait. For every item we write down what it protects and what the risk of the change is.
- Implementation. Hardening step by step, in a reversible way. The service keeps running; where downtime is unavoidable, we agree on the window in advance.
- Verification. A retest after the fixes and a written record of what changed.
How long does it take?
Hardening a typical single-server website or shop takes a few working days. For environments with several machines, databases and background services we give a deadline after the assessment — we do not invent numbers up front.
Frequently asked questions
Does my hosting provider not handle this?
No. A hosting provider supplies the infrastructure: the hardware, the network, the power. What runs on the server — the operating system configuration, the services, the permissions, the updates — is yours. With a managed plan there can be overlap, but the contract decides the details; it is worth reading what the provider does and does not take on.
Will my website go down during hardening?
Most of the work can be done without downtime. Where a restart is unavoidable — a kernel update, for example — we do it in an agreed window, and it usually means minutes.
What if something breaks after the changes?
Every change is preceded by a backup, and the steps are reversible. After hardening we retest, and the report lists what changed — so whoever touches the system later can see it too.
Do you work with Windows servers?
Our primary ground is Linux. In a Windows environment we take on the assessment and the access and network security work; if deeper, domain-level work is needed, we say so up front.
Is this a one-off job?
Hardening is a one-off project, but staying protected is maintenance: new vulnerabilities appear and systems change. That is why we recommend continuous monitoring alongside it — although it is not a condition for doing the hardening.