Websites stop working once WebShiled is enabled

Issue

• Immediately after enabling WebShield, sites running behind Cloudflare on the server start giving 502 errors.
• The web server supports only TLSv1.3.

Environment

• Apache
• Imunify360
• WebShield

Solution

1. Create an additional configuration file for WebShiled:

   # cat /etc/imunify360-webshield/webshield-server.conf.d/upstream_proxy_ssl.conf
   proxy_ssl_protocols TLSv1.2 TLSv1.3;

2. Restart Imunify360 and related services:

   # systemctl restart imunify360

Cause

Configuration conflict between WebShields' OpenResty and Apache.