We had to open ports in a firewall between the two servers to allow the Golden Gate Manager processes on each side to communicate with one another.
Initially, the ports seemed to be closed even though the firewall administrator claimed it was open.
Oracle Golden Gate needs two-way communication over the designated manager port, which by default is 7809.
So I used nmap to prove that it was indeed closed.
When the nmap status is closed or filtered, the man pages explains their state as
"Closed ports have no application listening on them, though they could open up at any time. Ports are classified as unfiltered when they are responsive to nmap's probes, but nmap cannot determine whether they are open or closed.
Filtered ports means that a firewall, filter, or other network obstacle is blocking the port so that nmap cannot tell whether it is open or closed."
Port 1521 was opened, as requested from the firewall team:
[root@myserver2 ~]# nmap -p 1521 myserver1 Starting Nmap 5.51 ( http://nmap.org ) at 2015-03-24 14:02 CET Nmap scan report for myserver1 (159.216.45.70) Host is up (0.0018s latency). rDNS record for 159.216.45.70: myserver1.mydomain.no PORT STATE SERVICE 1521/tcp open oracle
Port 7809 was closed, as seen by the output below:
[root@myserver2 ~]# nmap -p 7809 myserver1 Starting Nmap 5.51 ( http://nmap.org ) at 2015-03-24 15:14 CET Nmap scan report for myserver1 (159.216.45.70) Host is up. rDNS record for 159.216.45.70: myserver1.mydomain.no PORT STATE SERVICE 7809/tcp filtered unknown Nmap done: 1 IP address (1 host up) scanned in 2.08 seconds
Later, the port range 7809-7820 was opened, as can be seen below. Note that there is no activity on ports 7810-7820 so they are for the time being marked as closed:
root@myserver2 ~]# nmap -p 7809-7820 myserver1 Starting Nmap 5.51 ( http://nmap.org ) at 2015-03-24 15:48 CET Nmap scan report for myserver1(159.216.45.70) Host is up (0.0024s latency). rDNS record for 159.216.45.70: myserver1.mydomain.no PORT STATE SERVICE 7809/tcp open unknown 7810/tcp closed unknown 7811/tcp closed unknown 7812/tcp closed unknown 7813/tcp closed unknown 7814/tcp closed unknown 7815/tcp closed unknown 7816/tcp closed unknown 7817/tcp closed unknown 7818/tcp closed unknown 7819/tcp closed unknown 7820/tcp closed unknown
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