Which ports need to be open on a firewall for Oracle Database EE 19c and GoldenGate 19 to function

Question: Which ports need to be open on a firewall for Oracle Database EE 19c and GoldenGate 19 to function correctly?

Oracle Database 19.0

Oracle GoldenGate 19

These are the ports that need to be open based on the documentation I've read.

GG: TCP 7809, 7819 - 7899

DB: TCP 1521

However, I'm seeing the following error referencing port 21594:

Fatal NI connect error 12170.

  VERSION INFORMATION:
	TNS for Linux: Version 19.0.0.0.0 - Production
	Oracle Bequeath NT Protocol Adapter for Linux: Version 19.0.0.0.0 - Production
	TCP/IP NT Protocol Adapter for Linux: Version 19.0.0.0.0 - Production
  Version 19.17.0.0.0
  Time: 04-JAN-2024 14:45:18
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12535
    
TNS-12535: TNS:operation timed out
    ns secondary err code: 12609
    nt main err code: 0
    nt secondary err code: 0
    nt OS err code: 0
  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=10.18.0.200)(PORT=21594))