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from my understanding this port (9831) is used during the provisioning process by the BMI binary to communicate with the BL-Appserver and receive instructions for each setp in the process (Pre-Install, Disk-Partion, etc etc....)
According to some snippets from here https://docs.bmc.com/docs/display/public/bsa82/Configuring+DHCP
this communication done via SSL.
Which OS are you trying to provision, and will there be any BL infra components inside the DMZ ?
As if not, you will need to open much more ports in order to get a full provisioning-process working
- DHCP & PXE: 67, 68, 69 UDP
- Windows-Share: 138,139,445 TCP ( if you provision Windows OS)
- RSCD agent: 4750 TCP