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[Condor-users] Firewalls / ports

Most of our nodes are both submit and execute nodes. Some of them have
firewalls in
addition to the site firewall.

I am trying to understand a bit better how the various communications work
nail the firewall settings a bit better.

I am aware that there is both tcp and udp communications using 9614, 9618
and other 
"higher" ports.

For instance, could someone tell me, for a submit-only node, what ports
would need to
be open in its firewall?

Likewise for an execute only node.

How about for a central node?