I'm not sure if it's a fastly issue. Could be a middlebox as well. But why it's happening on certain DNS is unclear to me.
Edit: TTL on the RST packet and normal TCP packets are the same. Time to Live: 58
Beats me. For now lets blame fastly. They definitely messed up something. Btw what happens when you use bsnl or NextDNS. Any difference in network capture?
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