Identify port access needed for production

I believe I have a blocked port on a firewall.
When I run the code in the production system I get nothing back.
When I run locally I get a successful call and populated dataframe.

Does anyone know how to tell which ports are used when the call is made so that
I know what ports to request to be opened the the below?


library (edgar)

test_1 <- getDailyMaster("05/05/2020")

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