How to segregate web admin from 55414

Hello

I’ve an URBackup server into a segregated network.
I want to backup some machine in my LAN and I don’t want to expose the URBackup server over LAN network but only on the management network.
Can I’ve backup in pull mode without any open ports from LAN to Management ?
If port 55414 is necessary and I’ve to open it from LAN to Management how can I disable the web admin management from the LAN ?

My best regards