If a domain shows Apache’s default page, the wrong site, or a different result over HTTPS, changing DocumentRoot may not be the fix. The request must first resolve to the right server, arrive on the expected IP and port, match the correct ServerName/ServerAlias, and only then map to that virtual host’s filesystem directory.
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How Apache decides which directory to serve
A browser request passes through several independent decisions:
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- DNS resolution: the domain and aliases resolve to an IP address. Apache configuration does not create DNS records.
- Listener selection: the connection reaches a destination IP and port, normally 80 for HTTP or 443 for HTTPS.
- Virtual-host matching: Apache compares the request’s
Hostvalue withServerNameandServerAliasin virtual hosts attached to that IP and port. - Filesystem mapping: the selected host’s absolute
DocumentRootis combined with the URL path. - Directory handling: when the path is a directory such as
/, Apache usesDirectoryIndexto find an index file.
A failure at an earlier layer can make a correct directory setting appear broken. A default page usually indicates that the request did not match the intended host at all. A 404 or 403 after the right host is selected points to the path, permissions, or application instead.
Identify the exact symptom before changing configuration
| What you see | Most likely layer | First check |
|---|---|---|
| Apache default page | DNS, IP/port, Host matching, or vhost load order | Resolve the name, then inspect apachectl -S and aliases |
| Another site’s branded page | Request selected a different virtual host | Compare the destination IP, port, hostname, and first vhost for that address |
| 404 from the expected site | Correct vhost, wrong path or application route | Check DocumentRoot, file existence, and URL routing |
| 403 Forbidden | Correct vhost, but access or filesystem permissions prevent reading | Check directory permissions, access rules, and the error log |
| HTTP works but HTTPS does not | Port-443 vhost, certificate, or TLS alias problem | Inspect the separate *:443 configuration |
| Domain works locally but not for others | Local hosts-file override or DNS propagation | Compare public DNS with the client’s hosts file |
1. Verify DNS before editing Apache
Resolve the apex name and every alias you expect users to visit. Check both the bare domain, such as example.com, and www.example.com; subdomains require their own records as well. Compare each returned address with the server’s public IPv4 and IPv6 addresses.
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For a quick check from a terminal, query the records directly:
dig +short example.com A
dig +short example.com AAAA
dig +short www.example.com A
dig +short www.example.com AAAAOn systems without dig, nslookup example.com provides the same basic visibility. An A record points to IPv4, an AAAA record to IPv6, and a CNAME aliases one name to another. A stale, misspelled, or unintended record can send the browser to a different server even when Apache is configured perfectly.
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If a record is wrong, correct it at the DNS provider and wait for the record’s TTL. Different resolvers may continue returning the old value until that cache lifetime expires. Apache’s own virtual-host examples make the boundary explicit: creating a virtual-host configuration does not automatically create DNS entries for those host names.
A hosts-file entry is useful only for local testing. Add the server IP and name to the hosts file on the particular client machine, make the request, and remove the entry after testing. It does not publish the name for colleagues, customers, mobile devices, or public DNS resolvers.
2. Confirm the request reaches the intended IP and port
Apache chooses among virtual hosts associated with the connection’s destination IP and port. A working *:80 block cannot repair a missing or conflicting *:443 block. Likewise, a domain that resolves to an old server will never reach the configuration you just edited.
- Test HTTP at
http://example.com/and HTTPS athttps://example.com/separately. - Confirm that the DNS answer for each name is the address assigned to this server.
- Check that Apache is listening on the expected interfaces and ports according to the host’s service configuration.
- If a proxy, load balancer, CDN, NAT device, or firewall sits in front of Apache, verify that it forwards the request to the intended backend and preserves the hostname.
An IP-address request is not an equivalent test for a domain request. When you browse to an IP, the browser sends that IP as the host name, so Apache may deliberately select the default virtual host. Always test with the real domain in the URL or set the intended Host header in a controlled command-line test.
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3. Make the hostname match exactly
Every name users enter must be represented in the virtual host. Put the primary name in ServerName and additional accepted spellings in ServerAlias. Apache’s name-based-host documentation requires, at minimum, a ServerName identifying the host and a DocumentRoot identifying its content directory.
<VirtualHost *:80>
ServerName example.com
ServerAlias www.example.com
DocumentRoot /var/www/example
ErrorLog ${APACHE_LOG_DIR}/example-error.log
CustomLog ${APACHE_LOG_DIR}/example-access.log combined
</VirtualHost>The comparison is based on the hostname in the HTTP Host value. A missing www alias, a typo, an unexpected trailing name, or a request sent to a different port can therefore select another host. Decide whether both the apex and www should serve the same content or whether one should redirect to the other, then configure that behavior deliberately.
Do not assume that a wildcard or a similarly spelled name covers every case. List each required alias explicitly and check spelling, punctuation, and the domain’s actual public suffix.
4. Configure HTTPS independently
HTTPS normally uses a separate virtual-host block attached to port 443. It needs the certificate and key directives required by your Apache installation, the intended hostname aliases, and an intentional content or redirect policy.
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<VirtualHost *:443>
ServerName example.com
ServerAlias www.example.com
SSLEngine on
# Certificate directives for your installation go here.
DocumentRoot /var/www/example
ErrorLog ${APACHE_LOG_DIR}/example-ssl-error.log
CustomLog ${APACHE_LOG_DIR}/example-ssl-access.log combined
</VirtualHost>Keep the HTTPS DocumentRoot aligned with the HTTP site when both protocols should serve the same application. If HTTPS should redirect elsewhere, make that redirect explicit. Otherwise a request can work on port 80 and show a default or unrelated site on port 443.
Check certificate coverage as well as content selection. A certificate for only the apex name does not automatically cover www; the certificate’s names and the vhost’s aliases must agree.
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5. Validate what Apache actually loaded
Editing a file does not prove Apache read it. Test syntax first, then inspect Apache’s parsed virtual-host map:
sudo apachectl -t
sudo apachectl -SOn Windows, use the equivalent executable command:
httpd.exe -SThe syntax test should report that the configuration is valid. Do not reload a configuration that fails this test. The -S output shows the addresses and ports Apache recognized, the order of name-based hosts, and the source files associated with them. Use it after every virtual-host change.
Confirm all of the following in the output:
- The intended configuration file appears in the parsed map.
- The host is attached to the correct address and port, especially 443 for HTTPS.
- The expected
ServerNameand aliases are present. - No earlier virtual host is claiming the same name and address.
- The active configuration is the file you edited, not a similarly named copy in another directory.
If your distribution uses a separate “sites available” and “sites enabled” arrangement, make sure the file is enabled according to that distribution’s procedure. The exact enablement command differs by platform; the parsed -S output is the reliable proof that Apache loaded the result.
6. Understand why the default site appears
For a given address and port, Apache uses the first name-based virtual host when no configured ServerName or ServerAlias matches the request hostname. That first host is effectively the default for unmatched requests.
Consequently, the default page does not necessarily mean the default site’s directory is wrong. It can mean:
- DNS sent the browser to another server.
- The site file was never loaded.
- The request used an alias that is absent from
ServerAlias. - The request arrived on 443 while only port 80 was configured.
- An earlier virtual host for the same address and port is being selected.
- A proxy or load balancer changed the destination or hostname before Apache received it.
Changing the first site’s DocumentRoot may hide the symptom while leaving the hostname-matching problem unresolved. Fix the layer that is actually failing.
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7. Separate virtual-host selection from filesystem mapping
Once Apache has selected a host, it appends the URL path to that host’s absolute DocumentRoot. With DocumentRoot /var/www/example, a request for /images/logo.png maps to /var/www/example/images/logo.png.
For a request to /, Apache checks the filenames listed by DirectoryIndex, commonly an index HTML or PHP file. Verify that:
- The configured root directory exists at the exact absolute path.
- The expected index file is inside that directory.
- Subdirectories and files have names and capitalization matching the URL on case-sensitive systems.
- The account running Apache can traverse the directories and read the files.
- Application rewrite rules are present if the site depends on front-controller routing.
A 404 after the correct vhost is selected usually means the requested path is absent or the application generated the response. A 403 usually means access controls or permissions blocked the request. Neither status is fixed by adding another DNS record.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.8. Use logs and a deliberately bad URL
Watch the selected virtual host’s access and error logs while making a request. The sample configuration above gives each site separate log files, which makes it easier to see whether the request reached the expected host.
Apache’s troubleshooting guidance recommends requesting a path that is guaranteed not to exist. Use a unique marker such as:
https://example.com/this-path-must-not-exist-9f3c2Then locate the resulting 404 in the logs. The log file that records it identifies which virtual host handled the request. If the marker appears in another site’s log, return to DNS, port, alias, and vhost ordering rather than changing the intended site’s directory.
For temporary diagnostics, you can place a uniquely named test file or response marker in the intended root. Remove it as soon as the test is complete; diagnostic files should not remain publicly accessible.
Common failure cases and precise fixes
The apex works, but www shows the default page
Check that www.example.com resolves to the same intended address and that www.example.com appears in ServerAlias on both the HTTP and HTTPS hosts. If the design is canonical-apex-only, configure an explicit redirect instead of relying on an unmatched-host fallback.
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Inspect the *:443 entries in apachectl -S. Add or correct the HTTPS ServerName, aliases, certificate settings, and DocumentRoot or redirect. Test the HTTPS name directly after validating syntax.
The domain resolves to an old server
Compare public A and AAAA responses with the current server’s addresses. Correct stale records, account for the record TTL, and retest from a resolver that is not using the old cache. A local hosts-file override can make one computer appear fixed while public visitors still reach the old address.
The new configuration file is ignored
Run apachectl -t and apachectl -S. If the file is absent from the parsed map, it is not enabled, is outside the active include set, or Apache is using a different configuration tree than the one you edited. Enable or include it using your platform’s documented method, then validate again before reloading.
The right site answers, but the home page is a 404
Use the parsed vhost map and logs to confirm selection first. Then inspect the absolute DocumentRoot, the index file named by DirectoryIndex, URL capitalization, and application rewrite rules. Do not add another virtual host until those filesystem and routing checks are complete.
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Read the vhost error log for the specific denial. Confirm that Apache can traverse every parent directory and read the requested files, and review any directory access rules. Correct permissions and access policy without making the entire filesystem broadly writable.
A repeatable diagnostic workflow
- Write down the exact URL, protocol, hostname, and observed status or page.
- Resolve the apex,
www, and relevant subdomains; compare every result with the intended server address. - Check HTTP and HTTPS independently because they use different ports and may select different hosts.
- Verify
ServerNameand every requiredServerAliascharacter for character. - Run
sudo apachectl -t(orhttpd.exe -twhere applicable), correcting errors before any reload. - Run
sudo apachectl -Sorhttpd.exe -Sand confirm file, address, port, alias, and ordering. - Confirm the selected host’s absolute
DocumentRoot, index file, and read/execute permissions. - Make a request for a unique nonexistent path and identify the handling vhost from its logs.
- Reload Apache only after validation, then retest with the real hostname rather than the server IP.
When to involve the DNS or hosting administrator
You need DNS-provider access to change A, AAAA, and CNAME records. You need server access to change Apache virtual hosts, reload the service, and read logs. If you control only one side, provide the administrator with the exact hostname, protocol, destination IP, timestamp, status code, and the output relevant to the failing layer. A managed service can perform those changes, but the separation still matters: no hosting provider can make a wrong public DNS record select your server, and no DNS edit can repair an invalid Apache configuration.
Quick Recap
Final verification checklist
- Every public name resolves to the intended server address.
- HTTP and HTTPS each have an intentional virtual host.
ServerNameis the canonical name and all accepted alternatives are listed as aliases.- The intended configuration appears in
apachectl -Sorhttpd.exe -S. - The syntax test passes before reload.
- The selected host has the correct absolute
DocumentRootand expectedDirectoryIndexfile. - Apache’s account can read the content and traverse its parent directories.
- Access and error logs show the request in the intended vhost.
- A deliberately nonexistent URL produces a logged 404 in that same vhost.
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