Checking if a local port is used by another job on AS/400

There is a command called NETSTAT which will show you who is using local ports. Unfortunately it can only be used interactively and can only create spooled output.

To execute the command do: NETSTAT OPTION(*CNN)

                   Work with TCP/IP Connection Status                     

System:   S02    

Type options, press Enter.                                                     


   3=Enable debug   4=End   5=Display details   6=Disable debug                 


   8=Display jobs                                                               


      Remote           Remote     Local                                         
Opt  Address          Port       Port       Idle Time  State                   
      *                *          ftp-con >  000:40:52  Listen                  
      *                *          telnet     000:01:52  Listen                  
      *                *          smtp       000:00:01  Listen                  
      *                *          tftp       018:13:58  *UDP                    
      *                *          sunrpc     518:42:58  Listen                  
      *                *          sunrpc     063:18:20  *UDP                    
      *                *          ntp        000:49:31  *UDP                    
      *                *          netbios >  018:13:58  Listen                  
      *                *          netbios >  000:00:11  *UDP                    
      *                *          netbios >  000:00:13  *UDP                    
      *                *          netbios >  000:02:14  Listen                  
      *                *          snmp       000:12:53  *UDP                  

More...

F3=Exit   F5=Refresh   F9=Command line   F11=Display byte counts   F12=Cancel

F20=Work with IPv6 connections   F22=Display entire field   F24=More keys

      
From this screen you can use the F6 key to create spooled output…