Pinging directly will not work as it is behind the firewall.  We need to use curl pointing to the proxy to connect to cloudera.com at the OS level (could be any internet hostname) My previous responses tested using curl calling our proxy server at the OS level where NiFi is running and it is working. Only NiFi using Configuration service (Proxy server: HTTP) seems to broken with 2.7.2.  Before the upgrade from 1.26 to 2.7.2, NiFi worked connecting to cloudera using our own proxy server. ... View more