WMS and connection on port 4000

Hello,

we are in the process of making an assessment of our systems because we have to put a firewall between clients and server.

On our WMS server we see outgoing connections to port 4000 and 5900.

10.X.Y.Z	5900	tomcat9.exe	"C:\Program Files\DELL\WMS\Tomcat-9\bin\Tomcat9.exe" //RS//Tomcat9
10.X.Y.Z	4000	tomcat9.exe	"C:\Program Files\DELL\WMS\Tomcat-9\bin\Tomcat9.exe" //RS//Tomcat9
10.X.255	4000	tomcat9.exe	"C:\Program Files\DELL\WMS\Tomcat-9\bin\Tomcat9.exe" //RS//Tomcat9

 

5900 is the VNC port, but we don't know what the port 4000 is used for. I found no documentation.

Does anyone know why WMS tomcat connects to a client via port 4000?

Thank you very much 

Andreas