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 Topic: Ubuntu Virtual Host served by Cloudflare is displaying a 521 |
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NikLever
Joined: 27 Dec 2023
Posts: 3
Location: UK, Oldham
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 Posted: Wed 27 Dec '23 11:39 Post subject: Ubuntu Virtual Host served by Cloudflare is displaying a 521 |
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I am in the process of transferring a number of sites to a new server. I've moved two already and after lots of issues these two are displaying fine on the new server. I'm using Cloudflare and have updated the DNS so the Virtual Host displays the sites from the new server.
At first I update the DocumentRoot in /etc/apache2/sites-available/000-default.conf
For the problem site it then displays fine using the server ip address.
I have done a2ensite and can see the conf file in sites-enabled. My VirtualHost file is
| Code: | <VirtualHost *:80>
ServerAdmin webmaster@example.com
ServerName example.com
ServerAlias www.example.com
DocumentRoot /var/www/example.com/public_html
<Directory "/var/www/example.com/public_html">
AllowOverride All
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
# vim: syntax=apache ts=4 sw=4 sts=4 sr noet |
But if I change the Cloudflare DNS I get the 521 Error when trying to access the site using the domain name. If I switch the path in the Virtual Host to /var/www/html. I get the same error.
Not sure why two other sites work using essentially the same VirtualHost conf file, just with changed DocumentRoot, ServerName and Alias.
error.log and access.log don't show anything related to the problem.
Any suggestions.
mod note: changed domain name to exmaple.com |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7374
Location: Germany, Next to Hamburg
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| Posted: Wed 27 Dec '23 17:54 Post subject: |
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Error 521 means that cloudflare can't reach your server.
| Code: | | Internet<---->CF<---X--->YourRealIP |
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NikLever
Joined: 27 Dec 2023
Posts: 3
Location: UK, Oldham
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| Posted: Wed 27 Dec '23 18:06 Post subject: |
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| Yes, I understand that Cloudflare can't reach the website. The question is why and how to resolve it. As I explained two other sites on the same server with virtually the same VirtualHost conf files are working fine. |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7374
Location: Germany, Next to Hamburg
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| Posted: Wed 27 Dec '23 18:30 Post subject: |
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Things might to fix
1. Cloudflare points to the correct real IP
2. if you are using SSL on your server you might check the Encryption Settings from cloudflare
The encryptions modes can be:
- Flexible. All the connections between Cloudflare and your origin are via HTTP. Use this Flexible SSL if you cannot set up an SSL certificate for your domain.
- Full. Cloudflare connects to the origin server using either HTTP or HTTPS, depending on the visitor’s request. Choose the Full SSL mode if you have an SSL certification.
- Strict. Similar to Full, visitors can decide which protocol to use. However, this mode has more requirements for origin certificates.
3. sites-available is not sites-enabled. Is there a correct symlink to the new vhost?
4. restart apache to get the vhosts working. |
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NikLever
Joined: 27 Dec 2023
Posts: 3
Location: UK, Oldham
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| Posted: Wed 27 Dec '23 20:29 Post subject: |
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| It looks like it is the Cloudflare encryption mode. Many thanks. |
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