Website Showing Up But Not Working — Here is Why | URLWatch Blog

Last year a client called me very upset.

He said his customers were complaining that his website was not working. Orders were not going through. People were leaving.

I checked my website monitoring tool immediately. It said the website was UP . Green light. No alerts. Everything fine.

So I opened the website myself.

The homepage loaded perfectly. But when I clicked on the checkout page — blank white screen. Nothing. Just white.

The uptime checker never sent a single alert. Because technically the website was responding. The server was running. HTTP 200 was coming back.

But the website was completely broken for anyone trying to actually use it.

This is one of the most common problems in website health monitoring — your uptime monitor shows green but your website is not working for real visitors.

Here is exactly why this happens and what to do about it.

What Basic Website Monitoring Actually Checks

When a basic uptime monitoring tool checks your website, it does one simple thing.

It sends a request to your URL and waits for a response.

If the server responds with HTTP 200 — it marks your site as UP and moves on.

That is it.

It does not read the page. It does not check what is on the page. It does not verify that your checkout works, your contact form submits, or your images are loading.

It just checks: did the server respond?

And a server can respond perfectly fine with HTTP 200 even when your website is showing nothing but errors to real visitors. This is the fundamental limitation of basic site monitoring .

8 Ways Your Website Can Show Up But Not Be Working

1. Database Connection Error

Your server is running fine. But your database has crashed or disconnected.

The result: your website loads but shows "Error establishing a database connection" or just a blank page. Your uptime monitor sees HTTP 200. Your visitors see an error.

This is one of the most common website health check failures for WordPress sites. A plugin update, a server resource limit, or a MySQL crash can cause this instantly — and basic site monitoring will never catch it.

2. Maintenance Mode Left On

You were doing some updates. You turned on maintenance mode. Then you forgot to turn it off.

Your website is technically running and the uptime checker shows green. But every visitor sees a "Site Under Maintenance" page.

This has happened to so many agencies. A developer makes a change at 11pm, enables maintenance mode, finishes the work, and goes to sleep forgetting to disable it. Next morning hundreds of visitors see maintenance mode. The site monitoring tool never alerted anyone.

3. SSL Certificate Expired — Site Showing Security Warning

Your server is up. Your website is loading. But your SSL certificate expired.

Now every visitor sees a big red warning: "Your connection is not private" . Most people close the tab immediately.

Basic uptime monitoring does not check your SSL certificate. It just checks if the server is responding — and the server responds perfectly fine with an expired certificate. This is why proper website health monitoring must include SSL checking as a separate check.

4. A Specific Page is Broken While Homepage is Fine

Most uptime checkers monitor only your homepage URL.

But what if your homepage is fine and your checkout page is broken? The site monitoring tool checks the homepage, sees HTTP 200, and reports everything is fine. Meanwhile your customers are hitting a broken checkout and going to your competitor.

For e-commerce websites this is a critical gap in website monitoring . Your homepage can load in 0.5 seconds while your checkout throws a 500 error on every click.

5. Website Broken After a Plugin or Code Update

You updated a WordPress plugin or pushed new code. Everything looks fine on the surface.

But something broke. Maybe a JavaScript file is not loading. Maybe two plugins are conflicting. Your uptime monitor sees HTTP 200 and stays green.

But your navigation menu has disappeared. Your forms are not submitting. Your images are broken. Real visitors are confused and leaving. This is exactly the scenario where a proper website health check would catch what basic monitoring misses.

6. Website is Extremely Slow — Up But Unusable

Sometimes a website does not go down completely. It just becomes very slow.

Loading time goes from 1 second to 18 seconds. Technically the server is still responding — so the uptime monitoring tool says UP. But nobody waits 18 seconds for a page to load.

Without response time monitoring as part of your website health monitoring , you would never know this is happening. Your site is technically up but not working for anyone who visits it.

7. Domain Got Blacklisted — Emails Going to Spam

Your website loads fine. But your domain has been added to a spam or malware blacklist.

Your emails are going to spam for everyone. Some browsers and security tools are blocking your website entirely...