SSL handshake failed|| error code 525 in some ISP network


We are facing strange issue with our website. Our website is hosted in GCP and the DNS is hosted in Cloudflare using Cloudflare provided nameservers.

In India, we have checked with multiple devices and ISP network, found that our website perfectly working from some ISP network with SSL certificate HTTPS but when we are trying to open from another ISP network then we are getting following error as following:

SSL handshake failed Error code 525

It will be good if anyone please help us out. Thank you in advance.

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