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Status Future consideration
Workspace IBM Java SDK for z/OS
Created by Guest
Created on Jun 14, 2023

RELATED IDEAS

z/OSMF opens unnecessary Java RMI-Ports on public IP

When starting z/OSMF, it openes the configured Socket for normal work. 
And it also openes an secondary Port with moving port-number (every restart a different port), which gives  (on usage) a message which sounds like Java RemoteMethodInvocation.
Netstat-Output:
IZUSVR1  00000672 0.0.0.0..1027          0.0.0.0..0 (unwanted port)
IZUSVR1  00000658 190.22.2.10..1443      0.0.0.0..0 (normal Port)
I know z/OSMF is based on Websphere Liberty, but we have no own java applications in this Server-Task.
So Opening a Port is not the best option. 
Here the Message when trying to connect to this Port (1027 in Example above):
WARNING ¨ RMI TCP Accept-0: accept loop for ServerSocketÝaddr=0.0.0.0/0.0.0.0,localport=1027¨ throws
The server sockets created using the LocalRMIServerSocketFactory only accept connections from clients running on the host where the RMI remote objects have been exported.

1) Stop Opening this Port
2) If 1) not possible: Opening only on Localhost (127.0.0.1)
3) If 2) also not possible: Open it on a fixed port-number (configurable), so we can bind it in TCP-Stack to Localhost.

I first opened a Case and they mentioned:
https://bugs.java.com/bugdatabase/view_bug?bug_id=8035404

Idea priority Low

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