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Ports

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HI
I try to create something like that

Server license---> NAS ----> computers with agents
Which ports I have to block ,so that communications between NAS and computers stop work.

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Computers with agents communicate with NAS when they store backups there. Port 445 is used for CIFS share and port 21 - for ftp. If you close this port on computer, it won't be able to use any CIFS (ftp) resources, so I;m not sure if it is what you want. I'm also not sure what "server license" is and how it communicates with NAS in your diagram.