SuperServer port change from 51773 to 1972 on 2020.3+

Hello,

Recently I tried to connect to JDBC on IRIS 2020.3+ and I came across the following error:

 SQL Error [461] [08S01]: [InterSystems IRIS JDBC] Communication link failure: Communication error: Server closed communication device

This error implies that the port is not open.

Checking with the netstat command:

irisowner@78c3e30b7f41:/opt/irisapp$ netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State     
tcp 0 0 0 0.0.0.0:1972 0.0.0.0:* LISTEN    
tcp 0 0 127.0.0.11:38005 0.0.0.0.0:* LISTEN    
tcp 0 0 0.0.0.0:52773 0.0.0:* LISTEN    
tcp 0 0 78c3e30b7f41:52773 192.168.96.1:37048 ESTABLISHED
tcp 0 0 localhost:47580 localhost:1972 ESTABLISHED
tcp 0 0 localhost:1972 localhost:47590 ESTABLISHED
tcp 0 0 localhost:1972 localhost:47580 ESTABLISHED
tcp 0 0 localhost:1972 localhost:47596 ESTABLISHED
tcp 0 0 localhost:47596 localhost:1972 ESTABLISHED
tcp 0 0 localhost:47590 localhost:1972 ESTABLISHED
udp 0 0 127.0.0.11:39733 0.0.0.0.0:*

Actually, port 51773 is not open because since version 2020.3+ the superserver port is 1972 as Caché and Ensemble.

Hope this helps.