Do you run pfSense and want to change the message people see when a site is blocked? pfBlockerNG is the most popular pfSense package for blocking domains, ads, and malicious hosts — but its default block page is plain and confusing. This guide walks you through customizing it into a clear, branded message that your users actually understand.
The reality is that pfBlockerNG serves its block page through the DNSBL feature, so customizing the message means understanding how DNSBL works first. A good custom message tells users why a site was blocked and what to do next, instead of leaving them staring at a blank error.
This article explains, clearly and practically, everything about the pfBlockerNG block page: 7 easy steps, how DNSBL works, common problems and fixes, and safety tips. It is a technical guide — always test carefully on your own network.
Table of Contents
- What is pfBlockerNG?
- What is the block page?
- Why customize the message
- 7 steps to customize the message
- DNSBL and how blocking works
- Common problems and fixes
- Safety and maintenance tips
- Built-in modes vs a custom page
- Testing and verifying the page
- Myths to avoid
- Frequently asked questions
- Conclusion
pfBlockerNG: What Is This Package?
Let's start with the basics. pfBlockerNG is a package (an add-on) you install on pfSense, the popular open-source firewall. It lets you block domains, IP addresses, and advertising using curated lists (blocklists) together with the DNS resolver.
There are three key points to understand:
- It blocks both DNS and IP. It has two parts — DNSBL (domain-name blocking) and IP (address blocking).
- It uses feeds. Regularly updated global lists define what gets blocked (ads, malware, tracking, and more).
- It is customizable. You control what is blocked and what users see when they hit a blocked site.
Key point: pfBlockerNG is a pfSense package that blocks domains and ads using DNSBL and IP feeds — and it can be tuned to fit your network's needs. Understanding its two parts is the right starting point. Knowledge is network power.
What Is the pfBlockerNG Block Page?
This section matters because the block page is exactly what a user sees when they try to reach a blocked site.
When DNSBL blocks a domain, it redirects the user to a special address (a Virtual IP, or VIP) that serves a small web page or message. By default, that message is plain and generic — the user has no idea why the site was blocked.
Customizing it helps with:
- Clarity. The user understands the reason the site was blocked.
- Branding. You can add your organization's name or logo.
- Guidance. You can include instructions for requesting access if a site was blocked by mistake.
Warning: the block page only works through DNSBL (domain names), not through IP blocking — keep those two concepts separate.
Key point: the pfBlockerNG block page is the message a user sees when a domain is blocked — customizing it turns a blank error into a clear, useful notice. Clarity and guidance matter. An informed user beats a confused one.
Why Customize the Message
This section is practical because customizing the block page message brings real benefits.
- User understanding. When the message is clear, users don't panic and assume their computer is broken.
- Fewer IT tickets. A clear message reduces complaints and questions sent to the IT team.
- A professional look. A branded, well-designed page signals competence and good administration.
- Correct guidance. You can show how to request an unblock if a site was blocked in error.
Tip: if your network is a workplace or school, a clear message — even in your users' local language — makes the experience much friendlier.
Key point: customizing the pfBlockerNG block page message increases clarity, reduces IT tickets, and presents a professional image. An informed user beats a confused one. Clarity is what matters.
7 Steps to Customize the pfBlockerNG Message
This is the core of the article — the general steps to customize the block page. (Note: menus vary between versions, so always follow the official documentation for your version.)
- 1. Log in to pfSense. Open the pfSense admin interface and go to Firewall → pfBlockerNG.
- 2. Confirm DNSBL is enabled. Open the DNSBL tab and make sure it is turned on (Enable).
- 3. Find the DNSBL Webserver / VIP settings. This is where the block page and the VIP address are managed.
- 4. Choose the page mode. pfBlockerNG offers built-in pages — pick one, or prepare a custom page.
- 5. Edit the message / HTML file. You can edit the block page file (usually HTML) to insert your own text and branding.
- 6. Save and reload. Save your changes, then reload DNSBL so they take effect.
- 7. Test it. Try to visit a blocked domain to confirm the new message appears.
Warning: every time you change something, save and test — and keep a backup before editing any system files.
Key point: to customize the pfBlockerNG message: log in to pfSense, confirm DNSBL, find the VIP/Webserver settings, edit the page file, save, reload, and test. Backups and testing are essential. Caution protects the system.
DNSBL and How Blocking Works
This section matters because understanding DNSBL explains how the block page works at all.
- DNSBL (DNS-based). It blocks domain names when they are requested — this is where the block page comes from.
- IP blocking. It blocks IP addresses; it shows no block page, it simply drops the connection.
- VIP (Virtual IP). DNSBL points blocked domains to a special address that serves the block page.
- Feeds (lists). You choose different lists (ads, malware, adult content) to block the categories you want.
Tip: if a legitimate site gets blocked, add it to the whitelist (allow list) so it is never blocked again.
Key point: DNSBL serves the pfBlockerNG block page (domains), while IP blocking only drops the connection — VIP and feeds define what gets blocked. Understanding both is essential. Knowledge is good administration.
Common Problems and Fixes
This section is practical because common issues appear when configuring the block page.
- The page doesn't show (HTTPS). HTTPS sites usually don't display a block page — they only show a connection error. This is normal, because HTTPS can't be intercepted this way.
- Changes don't apply. Make sure you reloaded DNSBL after editing.
- A site was blocked by mistake. Use the whitelist to allow it.
- The old message keeps appearing. Clear the browser and DNS cache.
- Edited files vanished after an update. A package update can overwrite your edits — keep a backup.
Warning: because of HTTPS, the block page often only appears on HTTP sites — this is a technical limitation, not a mistake you made.
Key point: common pfBlockerNG problems are HTTPS not showing a page, changes not applying, and an update wiping edits — reload, whitelist, and backups are the fixes. Understanding HTTPS matters. Patience and backups protect you.
Safety and Maintenance Tips
This section matters because configuring a firewall is a security responsibility.
- Keep regular backups. Before changing anything, save your pfSense configuration.
- Don't edit system files carelessly. Only edit the block page files; don't touch settings you don't understand.
- Update feeds and the package. Stale lists don't protect well.
- Protect admin access. Use a strong password and restrict who can reach pfSense.
- Follow the official docs. Every version differs — check the Netgate documentation.
Warning: the firewall is the center of network security — a wrong change can open security holes. When unsure, consult an experienced person.
Key point: managing pfBlockerNG requires regular backups, careful editing, updates, and protected admin access. Security is the top priority. Knowledge and caution protect the network.
Built-in Modes vs a Custom pfBlockerNG Page
This section matters because pfBlockerNG gives you more than one way to present the block page, and choosing the right one saves effort.
Out of the box, DNSBL can respond in a few different ways, and understanding them helps you decide how much to customize:
- DNSBL mode with the built-in page. The resolver returns the VIP, and the built-in web server serves a small, generic page. This is the easiest starting point and the one you customize by editing the HTML file.
- A blank or 1×1 pixel response. Some administrators prefer a silent block (a tiny transparent image) instead of a visible page, especially for ads. This keeps ad slots from breaking the layout of a site.
- A fully custom HTML page. For a branded experience, you replace the default file with your own HTML, including your logo, colors, contact details, and an unblock-request link.
- External redirect. Advanced setups redirect blocked requests to a page hosted elsewhere, though this adds complexity and depends on HTTP.
Tip: for ads, a silent pixel response is often best; for policy blocks (workplace or school), a clear branded page communicates intent much better.
Key point: pfBlockerNG can serve a built-in page, a silent pixel, or a fully custom HTML page — choose the mode that matches your goal. A branded page suits policy blocks; a pixel suits ads. Match the response to the purpose.
Testing and Verifying Your Block Page
This section is practical because a change you never test is a change you can't trust.
After editing the block page and reloading DNSBL, verify the result properly rather than assuming it worked:
- Visit a known-blocked HTTP domain. Because of HTTPS limits, test with an HTTP site or a domain you know is on a blocklist.
- Check from a client device, not the firewall. The experience should be verified from a normal user's computer on the network.
- Clear caches first. Browser and DNS caches can show you the old message — clear them before judging the result.
- Review the DNSBL logs. pfSense logs show whether the domain was matched and redirected to the VIP, which confirms the mechanism is working.
- Test the unblock path. If your page includes an unblock-request link or instructions, make sure they actually work.
Warning: if a legitimate site is caught, don't disable the whole feature — just whitelist that domain and reload. Disabling everything to fix one false positive removes all of your protection at once, which is almost never the right trade-off.
Key point: always test the pfBlockerNG block page from a client device, clear caches, and review the DNSBL logs to confirm it works. Verification turns guesswork into confidence. A tested change is a trustworthy change, and it saves you from surprises when real users hit the page.
pfBlockerNG Myths to Avoid
This section matters because misunderstandings cause management problems.
- "pfBlockerNG shows a block page for every HTTPS site." False. Because of HTTPS, you usually see a connection error, not a clear block page.
- "Customizing once lasts forever." False. A package update can overwrite your edits — keep a backup.
- "It replaces antivirus." False. It blocks domains and IPs, but it is not antivirus — use additional protection.
- "IP blocking shows a block page." False. Only DNSBL shows the block page; IP blocking drops the connection.
Warning: myths lead to wrong configuration and unrealistic expectations — rely on the official docs and testing. When in doubt, check the Netgate documentation.
Key point: rely on official docs and testing, not myths. There are many misconceptions about pfBlockerNG — the truth is that HTTPS limits the page, backups are essential, and it is not antivirus. Knowledge is power.
Frequently Asked Questions
1. What is pfBlockerNG?
It is a pfSense package used to block domains, IP addresses, and ads, using DNSBL (domain names) and IP blocking. It can be customized to fit your network's needs.
2. How do I change the block page message?
Go to pfSense → Firewall → pfBlockerNG → DNSBL, find the Webserver/VIP section, edit the block page file (HTML), save, reload DNSBL, and test. Keep a backup first.
3. Why doesn't the block page appear?
Usually HTTPS. HTTPS sites don't display a block page — they only show a connection error. This is a technical limitation, not a mistake you made.
4. What is DNSBL?
It is DNS-based blocking — it blocks domain names when requested. This is where the block page comes from; it points blocked domains to a VIP address that serves the message.
5. What's the difference between DNSBL and IP blocking?
DNSBL blocks domains and shows a block page. IP blocking blocks IP addresses and only drops the connection — it shows no page.
6. Will my edits survive an update?
Sometimes not. A package update can overwrite the files you edited. Keep a backup and reapply your edits if needed.
7. How do I allow a site blocked by mistake?
Use the whitelist (allow list) inside pfBlockerNG. Add the domain, save, and reload DNSBL. It will no longer be blocked.
8. Does pfBlockerNG replace antivirus?
No. It blocks malicious domains and IPs (ads, malware), but it is not antivirus. Use additional protection such as antivirus and system updates.
9. Do I need technical skills?
Yes, some. pfSense is a technical system that needs networking knowledge. If unsure, consult an experienced person, and always keep a backup before changes.
10. Where do I find official documentation?
Netgate (the maker of pfSense) publishes official documentation for pfBlockerNG. Every version differs, so always follow the docs for your version.
11. Is configuring the firewall risky?
A wrong change can open security holes or cut off internet access. Keep a backup, edit only what you understand, and test in a safe environment first.
12. Can I write the message in another language?
Yes. The block page file is HTML, so you can write the message in any language, including your users' local language, to make it friendlier.
Conclusion
pfBlockerNG is a pfSense package that blocks domains and ads using DNSBL and IP feeds — and it lets you customize the block page your users see. The seven steps above show how to change the message into something clear and branded.
Three things to remember. DNSBL serves the block page — IP blocking shows none. HTTPS is a limitation — HTTPS sites usually won't display a custom page. Backups are essential — an update can overwrite your edits.
Once you understand this, you won't run into unnecessary trouble — you'll base your decisions on knowledge, not myths. A firewall is a powerful tool; careful configuration and backups protect your network. Knowledge, testing, and the official docs are the right path. When unsure, consult an experienced person.
Action: Your Next Step
If you're considering this: first, take a backup — save your pfSense configuration before changing anything. Second, go to Firewall → pfBlockerNG → DNSBL, find the Webserver/VIP section, and edit the block page HTML file to add your own message and branding, even in your local language. Save, reload DNSBL, and test on a blocked domain. Remember that HTTPS limits visibility, that the whitelist allows a mistakenly blocked site, and that an update can wipe your edits — so keep a backup. Rely on the official Netgate documentation, not myths. Knowledge, caution, and testing are the right path.