[ubuntu] how to manage firewall

[ubuntu] how to manage firewall


I want to set up my firewall to start with by allowing all outgoing, but block all incoming. However, I *think* I have applications installed that require ports to be open for some incoming. I’d rather not just wait to see what doesn’t work to find that out. How can I go about determining which ports each application is designed to depend on being open? Also – When installing a new application, how can I know which ports it may depend on being open?


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