Vietnamese users cannot access one of our subdomains

We have a website at which is viewable on both desktop and mobile browsers.

However it seems that Vietnamese users are unable to see the mobile site now, where the domain is unreachable or there’s an EMPTY_ERR_RESPONSE. However, they have no issues going to other sites such as or which have the same code.

Our teams in India and Singapore are able to see the mobile version of, but not the Vietnamese users.

Is there an issue with the DNS or possibly one of the nodes in Cloudflare? The majority of Vietnamese users can’t see the site now.

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