Http error 521

Website, Application, Performance Getting Started
1

What is the name of the domain?

https://perfectt-shop-india.online/

What is the error number?

error 521

What is the error message?

This page isn’t working If the problem continues, contact the site owner. HTTP ERROR 521

What is the issue you’re encountering

All the domains I added before yesterday are still working fine. But starting from yesterday, any new domain I add is not opening—whether the proxy is ON or OFF. This issue only started yesterday.

What steps have you taken to resolve the issue?

All the domains I added before yesterday are still working fine. But starting yesterday, any new domain I add is not opening, regardless of whether the proxy is ON or OFF. I’ve changed the Cloudflare account, tried with 3 different servers, and even contacted the domain provider as well as all three hosting providers—everyone says things are fine on their end. Yet, the issue still persists.

What are the steps to reproduce the issue?

Simple open the website Uploading: Screenshot 2025-05-10 at 3.14.01 PM.png…

1 Like
2

Hi,

It looks like you have a configuration problem on your OpenLiteSpeed server.

My assumption is that you have added the ssl certificates for “summer-clearancesale.shop” to the HTTPS listener on the Webadmin.
This will cause that certificate to be used for all virtual hosts

Can you check the following:

  • You have each virtual host setup correctly (please share the configuration if the below doesnt resolve your issue)
  • Each virtual host has its own certificates

To set up SSL for our each virtual host in the WebAdmin Console, navigate to Virtual Hosts > vHostName > SSL > Edit SSL Private Key & Certificate.
Update the new SSL settings with the following example as a guide, using your own file paths:

  • Private Key File = /usr/local/lsws/conf/example.key
  • Certificate File = /usr/local/lsws/conf/example.crt
  • Chained Certificate = Not Set
  • You have added the mapping to the listeners for each vHost

Navigate to Listeners > HTTP > Virtual Host Mappings and click the Add button. Use the following values to map the HTTP listener to the Example2 virtual host:

  • Virtual Host = Example2
  • Domains = example2.com, www.example2.com
    Repeat for the HTTPS listener using the exact same settings.
  • You have removed the SSL certificate

Remove the SSL on the listener you named HTTPS, navigate to Listeners > HTTPS > SSL, and click the Edit button. Remove the private key and certificate path, then click the Save button.