Learn how to check whether a website is online, understand HTTP errors, and troubleshoot DNS, SSL, redirects and server problems.

When a website stops loading, it is not always obvious whether the problem is with the website itself, your internet connection, DNS, the hosting server, or your browser.

Checking a website's status helps you determine whether the server is reachable before spending time troubleshooting the wrong problem.

Toolora provides a Website Status Checker that can quickly test whether a website responds to an HTTP request.

What Does “Website Online” Mean?

A website is generally considered online when its server accepts a connection and returns an HTTP response.

For example, a website may return:

• 200 OK — the requested page loaded successfully.
• 301 or 302 — the page redirects somewhere else.
• 403 Forbidden — the server is online but refuses access.
• 404 Not Found — the server works, but that page does not exist.
• 500 Server Error — the server responded but the application encountered an error.
• 502 or 503 — the server or upstream service may currently be unavailable.

This means that a website can technically be online even when visitors see an error page.

How to Check a Website's Status

You can use the Toolora Website Status Checker.

1. Enter the website URL.
2. Start the check.
3. Review the HTTP response.
4. Check whether the host responded successfully.
5. If an error appears, investigate the corresponding HTTP status code.

Try it: Link this text to your Website Status Checker tool.

Why a Website May Be Unreachable

There are several common causes.

Hosting Outage

The web server may be temporarily offline because of maintenance, technical problems, resource limits, or infrastructure issues.

DNS Problems

DNS translates a domain such as example.com into an IP address.

If the DNS configuration is incorrect or has not fully propagated after a recent change, users may be unable to find the server.

SSL Problems

HTTPS websites depend on valid SSL/TLS configuration.

An expired or incorrectly configured certificate can cause browsers to display warnings or refuse secure connections.

Application Error

Sometimes the server itself is running correctly, but the website application fails.

A common example is:

500 Internal Server Error

Possible causes include application bugs, incorrect configuration, missing dependencies, or database problems.

Firewall or Security Rules

Firewalls, CDN rules, rate limits, geographic restrictions, and anti-bot systems may block certain visitors even when the website itself is online.

Is the Website Down for Everyone or Just You?

If a website loads for other people but not for you, check:

• your internet connection
• browser cache
• DNS cache
• VPN settings
• firewall software
• browser extensions
• alternative networks

Try opening the website from a phone using mobile data. If it works there but not on your normal connection, the issue may be local.

Check the Website's DNS

If the domain cannot be resolved, use a DNS lookup tool.

DNS records such as:

A
AAAA
CNAME
MX
TXT
NS

help determine where the domain points and which services are configured.

Related Tool: Link to your Domain DNS tool.

Check the SSL Certificate

For an HTTPS website, verify that the certificate:

• has not expired
• matches the hostname
• has a valid certificate chain
• is being served correctly

Related Tool: Link to your SSL Checker.

Check Redirects

A site may appear broken because of a redirect loop or incorrect destination.

For example:

example.com
→ www.example.com
→ example.com
→ www.example.com

creates a loop.

A redirect checker can show each URL the browser is being sent through.

Related Tool: Link to Redirect Checker.

Check the HTTP Headers

HTTP headers can reveal useful technical details including:

• response status
• caching information
• content type
• security headers
• redirect location
• server information

Related Tool: Link to HTTP Headers Parser.

Website Monitoring vs a One-Time Check

A status checker tells you what is happening right now.

Monitoring services go further by checking a website repeatedly and recording uptime over time.

For occasional troubleshooting, a one-time status check is usually enough. For business-critical websites, automated monitoring can provide faster notification of outages.

Frequently Asked Questions

Does a 404 mean the entire website is offline?

No. A 404 normally means the server is online, but the requested page does not exist.

Does a 500 error mean the hosting server is offline?

Not necessarily. It usually means the server responded but the application experienced an internal error.

Why does a website work for me but not someone else?

Possible reasons include DNS differences, network restrictions, geographic blocking, cached information, or local browser/network problems.

Can a status checker guarantee a site works for every visitor?

No. It checks connectivity from the environment performing the test. Geographic restrictions and network-specific problems may produce different results elsewhere.

Final Thoughts

When a website becomes unreachable, start with the simplest checks before making configuration changes.

A useful troubleshooting sequence is:

1. Check whether the website responds.
2. Review the HTTP status.
3. Verify DNS.
4. Check SSL.
5. Inspect redirects.
6. Review HTTP headers.
7. Test from another network.

Toolora's web utilities can help you perform each of these checks from one place.