Why does PyCharm need "incoming connections"?

Why does PyCharm (and for that matter PhpStorm) need "incoming connections"? What, exactly, are these connections used for? I have to block all incoming traffic to my machines and need to know what functionality is lost by doing so for PyCharm (and PhpStorm), and whether doing so will affect performance (e.g., because of polling on a connection that's blocked).

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