Request failed with status code 502

after restarting DNIF “core+console” server, getting an error “request failed with status code 502”

when executing ‘docker ps’ command on the server
d4994f7ec760 dnif/datanode:v9.1.1 “/bin/sh -c '/bin/ba…” 4 days ago Restarting (2) 17 seconds ago datanode-master-v9

Hello buddy
I am not getting the exact issue you are facing so you can share the snapshots where you are getting the error. Also, share the snapshots of the below commands.
docker ps
docker ps -a
docker-compose logs -f
docker images
Also, Have you met all the prerequisites before installing? You can find the prerequisites and Minimum Requirements in the below document.
https://docs.dnif.it/docs/before-you-begin
https://docs.dnif.it/docs/minimum-requirements?highlight=min