GitHub user potiuk added a comment to the discussion: Airflow tasks fails with 
Response ended prematurely when the job remains silent for more then 15 minutes

Likely you have a firewall in-between that closes connection on inactivity. 
Depending on the way how you make your requests - which library you are using, 
what requests you make, the usual solution is setting TCP keepalive or simialr 
configuration on your TCP connection. How you set it up, depends solely on the 
way what you do in your Dag most likely and you need to look it up in 
documentation on how to enable it. 

Or you need to configure it in whatever firewall you have.

This is wild guess, but quite likely

GitHub link: 
https://github.com/apache/airflow/discussions/58614#discussioncomment-15060153

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