I have to agree that Eddy is being a little trollish. The OP was not asking how to open ports on a Sonicwall. He was asking if anybody knew which ports Avast Business required for operation. Not an unreasonable request. This link might be helpful:
https://support.business.avast.com/hc/en-us/articles/205154325-What-ports-and-IP-addresses-do-my-clients-use-to-communicate-with-the-server-