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nifi problem with nginx failed connection to processor


I have a problem between nifi and nginx. Every time I have an error in the configuation of a processor nifi, I have an erreur I update the page then I have the error 502 bad gateway when I look at logs nifi I have nothing.

Nginx log :

57192 connect() failed (111: Connection refused) while connecting to upstream, client:, server: *.*******.com, request: "GET /nifi/?processGroupId=2553cbd4-0163-1000-4888-b79521a7b2fb&componentIds=256075ff-0163-1000-2f7f-d4cfd7d23db3 HTTP/1.1", upstream: "", host: "******.com"