Jaap, yes, you are right, the communication itself is another good consideration. For that, monitoring (on the port numbers) is always a good option, and , again, check the log files. I experienced the communication issue by firewalls several times, and with Enterprise Guide a lot. And any configuration made (by a internal or external responsible) should be aligned with internal IT policies. You can check (and monitor) your firewall rules and port numbers, so they can be aligned and you will be notified when there is a problem in communications.
... View more