When accessing website, it showing error 521 webserver not responding

Website, Application, Performance DNS & Network
1

What is the name of the domain?

mediexpress.com.my, hcsb.com.my

What is the error message?

521

What is the issue you’re encountering

When accessing the website, it showing error 521 host is not responding intermittent

What steps have you taken to resolve the issue?

Have checked firewall logs, it not showing any deny and rate limits for cloudflare IP address

What feature, service or problem is this related to?

DNS records

2

The WWW record is working for this hostname.

When using Full Strict the subject name must match the hostname on the origin certificate.

It appears you have one that matches for WWW but not the root domain.

CN=*.mediexpress.com.my