Solution for the 421 Misdirected Request Error

421 Misdirected Request

A common issue affecting many websites today:

With the latest Apache update, a 421 Misdirected Request error will now be returned if the SNI (Server Name Indication) header is missing or mismatched.

This occurs when HTTPS requests are passed to Apache without the proxy_ssl_name header.

You can fix the issue by running the following command via SSH:

echo -e "proxy_ssl_server_name on;\nproxy_ssl_name \$host;" > /etc/nginx/conf.d/fixssl.conf && systemctl restart nginx