What ports have to be opend on a firewall

What ports have to be opend on a firewall

I'm trying to do a domain scan for workstations. I'm running into a problem. We use firewall on our laptops that is blocking access. The message is "Connection to RPC server in the workstation failed. ". If I disable the firewall, the scan is successful. Please let me know what ports must be opened in order to get a successful scan.

TIA.
Hank Arnold


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