Hosting Glossary
What is Firewall?
What Firewall actually means, minus the jargon — with the example that makes it obvious.
The short answer
A firewall filters network traffic by rule — deciding which connections may reach which services, and refusing the rest by default.
Below: the fuller explanation, an analogy that makes it stick, why it matters in practice, and where you'll actually meet it.
Written by the HostingAlly team · Last revised 27 July 2026
100+
Terms in this glossary
2 min
Average read
Plain
English, promised
24/7
Humans if you're stuck
On servers the model is default-deny inbound: explicitly allow SSH and web ports, and everything else becomes unreachable. Host firewalls (ufw, firewalld) enforce per-machine; network-level protection filters upstream.
It's the complement to application security — the firewall bounds what's reachable at all; the WAF and application hygiene govern what happens on the ports that are.
The analogy version
The gatehouse with a guest list — named visitors to named departments pass; everyone else meets a closed gate rather than an unlocked lobby.
Hold onto that picture and most of the documentation you'll ever read about it becomes considerably less mysterious.
Why you should care
An unfirewalled server exposes every running service to the internet's continuous scanning — the five-command default-deny setup is among the highest-value minutes in server administration.
That's the test for every technical term, incidentally — not 'do I understand it fully' but 'do I know when it's the answer to my problem'. For this one, now you do.
A concrete example
A VPS runs a database privately — the firewall allows web ports publicly and the database port to localhost only, so the scanners probing it worldwide meet silence.
Multiply that example across every site on the internet and you have the concept's entire job description.
How this shows up in your hosting
On our hosting this mostly takes care of itself — the platform applies the sensible defaults, and the panel exposes the controls when you want them. The concepts worth knowing next: WAF, DDoS Attack, VPS and SSH.
Every plan includes free SSL that renews itself, so the padlock is never your job.
Jargon is a service failure
Every confusing term in hosting eventually becomes a support ticket — so we defined the hundred most common ones properly, once, in the plain English we'd use on the phone.
Support is answered by real people around the clock — including the questions other hosts call out of scope.
- 100+ terms, plain English
- Analogies and real examples
- Cross-linked related concepts
- Written by the support desk
Why HostingAlly
Every plan includes this, whatever you pay
One term, fully landed
Firewall defined, pictured by analogy and placed in your own control panel — recognise-level in a single read.
Plain English first
Every term defined for site owners, not for other sysadmins — jargon translated, not restated.
Linked, not siloed
Related terms cross-reference, so one lookup becomes a working understanding.
The next reads, mapped
This entry connects to WAF and DDoS Attack — concepts travel in packs, and the pack is linked.
Honest about what you can skip
Most terms are recognise-level, not operate-level — the glossary says which is which.
Analogies that stick
Each concept gets a picture you'll remember at the moment you actually need it.
Getting Started
How to get going
- 1
Spot it in your own setup
The fastest way to learn a hosting term is to find it in your own panel — five minutes of looking beats an hour of reading.
- 2
Check the defaults
Our platform ships sane defaults for this — verify rather than assume, and you'll know your setup instead of hoping about it.
- 3
Follow the related terms
Concepts travel in packs — WAF, DDoS Attack and VPS complete this one's picture, and each is a two-minute read away.
Included
What's covered on our plans
- Free domain for the first year on annual plans
- Staging environments for risk-free changes
- Webmail plus IMAP, POP and SMTP access
- SSH, Git and Composer access on developer-friendly plans
- One-click installer for WordPress and 400+ apps
- Free website migration handled by our team
- Daily automatic backups with self-service restores
- WordPress Toolkit with automatic updates
- Per-site PHP version selection
- DDoS protection at the network level
FAQ
Your questions, answered
Do shared hosting customers manage a firewall?
No — platform firewalls and protections are host duty (part of what managed means). Firewall administration begins with a VPS, where the machine's gate list is yours to write.
Firewall versus WAF — what's the difference?
Layers — the firewall filters by port and address (can this connection reach the service?); the WAF reads HTTP content on allowed connections (is this request an attack?). Serious setups run both.
What happens if I outgrow my plan?
You upgrade in place — plan changes apply from your client area without migrations or downtime, and our range runs from small shared plans through VPS to dedicated servers, so growth is an account change rather than a new-host project.
Do you include email with hosting?
Yes — mailboxes on your own domain come with every hosting plan, with webmail, IMAP/POP/SMTP access and spam filtering. Standalone email hosting also exists for domains whose websites live elsewhere.
Can I choose my PHP version?
Yes — PHP versions are selectable per site from the control panel, so a legacy application and a current one can live side by side. Extensions and per-site settings are adjustable in the same place, no support ticket needed.
Can I host more than one website on a plan?
On the Pro tier and above, yes — multiple sites with their own domains, email and SSL under one account. If the extra sites belong to clients rather than you, reseller hosting gives each one proper isolation instead.
Is SSL really included at no cost?
On every plan, with no exceptions — certificates are issued automatically when your domain points to us and renew themselves before expiry. The encryption is identical to paid DV certificates; paid tiers exist only for wildcard convenience or organisation-level validation.
Keep exploring
SSH (Secure Shell)
SSH is the encrypted protocol for operating a server through a terminal.
VPS (Virtual Private Server)
A VPS is a virtual machine carved from a physical server, giving you dedicated resources and root access at a fraction of a whole server's price.
WordPress Hosting
Managed WordPress with LiteSpeed caching, staging and automatic backups.
VPS Hosting
KVM virtual servers with root access, DDoS protection and flat pricing.
Planning to switch hosts? Grab the checklist here.
The steps that keep a site migration dull rather than dramatic: what to back up first, how to shift email across without losing a single message, when to touch DNS, and the two mistakes behind nearly every hour of downtime we come across.
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