FYI: Testing the reverse proxy configuration with netcat fails if you have IPv6 disabled.
On our cluster all our nodes explicitly have IPv6 disabled. When trying to test the reverse proxy setup for OOD, we get this type of failure:
[user@node ~]$ nc -l 5432 close: Bad file descriptor
This is due to netcat attempting to close a non-existent IPv6 listening socket. The work around is to issue the command with the “-4” parameter to force nc to only open an IPv4 listening socket.
Here’s the RHN reference info: netcat returning "Bad file descriptor error" after a connection is made - Red Hat Customer Portal