When customizing a Dynamic Capacity Intelligence (DCI) Controller region JCL, a TCP port number must be provided. There are some TCP commands that can help determine if a port is already in use.
IP ports cannot be shared between different regions. Moreover, a port can be reserved to a specific region.
DCI 2.0 and above on z/OS
If the DCI Control region is started with a TCP port that is "reserved" to a different region, then the following message is returned:
DCI0999E: ERROR BIND : (0000000D/FFFFFFFF)
See "DCI1322E and DCI0999E ERROR BIND 0000000D on DCI Controller joblog" article for additional details.