Firewall configuration for Azure Event Hubs plugin

We tried to retrieve data from an Azure EventHub. Locally it works perfect but in our test environment it didn't. We suppose that a firewall is blocking the traffic since we get a timeout without error message.

Can anybody tell me which endpoint is initializing the connection and on which port?
Is it the Logstash plugin or the Azure EventHub plugin?

Many thanks!!

Take a look at the Microsoft docs under "Connections and sessions".

I cannot imagine any way that it could not be logstash initiating the connection.

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