lens7 commented on issue #11371:
URL: https://github.com/apache/airflow/issues/11371#issuecomment-714279027


   Basically, i guess this issue is either isn't encountered much, so found the 
real reason for this kind of error, its somewhat associate with the network, 
**The scheduler doesn't appear to be running, last heart was received X 
days/minutes/hours ago**, so have located the exact firewall rules that needs 
to be tuned a little to get the network setup correctly in order to fix the 
issue, attaching a screenshot for the rules 


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