They need to open the high ports on the firewall. also called ephemeral ports.
The handshake is made on 5533, but then the connection is handed off to the
higher port. I have only seen this on highly aggressive firewalls, but the only
fix is to make sure the high ports are not blocked.
Sent from my iPhone
On Oct 15, 2018, at 8:00 PM, Mladen Gogala <gogala.mladen@xxxxxxxxx> wrote:--
Hi!
I have a Data Guard configuration which goes through a firewall. Oracle*Net
is on a proprietary port 5533 which is open from both sides, but for some
reason, the standby DB every now and then attempts to use a strange port
55501 which is not open. Needles to say, connection fails and there is an
alert. Does anyone know how to restrict the ports used by Oracle*Net? The
platform is Oracle Linux 7.5, Oracle RDBMS 12.1.0.2.
Regards
--
Mladen Gogala
Database Consultant
Tel: (347) 321-1217
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