jmli1024 commented on issue #19771:
URL: https://github.com/apache/airflow/issues/19771#issuecomment-1923301469

   I saw that nobody has resolution. I have same problem and record the 
solution to this error.
   In my case, my airflow is deployed in eks. I don't know when I have modified 
the security group of nodegroup, which causes this problem.
   (1) Because coreDNS service was deployed in one node, airflow pods need to 
access to coreDNS service for resolving domain name. However I deleted a rule 
which is for connection between node and node and this rule includes DNS 53 
rule. So the security group did not allow cross node access to DNS services.
   (2) Finally, the security group of nodegroup, allow it to allow all 
protocols and ports on its own inbound. This problem is resolved.


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