Netbackup is running without bpcd communication

Hi Experts,

I have a situation where my client backup is running fine without bpcd communication. As per my previous experience, it was my understanding that we must have two way commnication on master <--> client on bpcd & nvetd port.

My client responds to master server through vnet port but not through bpcd.

Master server version. >>>>  7.5.0.4

Client version >>>>  6.5.6

Thanks