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Little Snitch tells me that RSSOwl often wants to connect to various endpoints (e.g., javaadventure.blogspot.com) on port 443 ?
Why all the 443 connection attempts?
Port 443 is commonly used for https connections. RSSOwl needs to make connections to the feed provider via HTTP (Port 80 or 8080) or HTTPS (Port 443). javaadventure.blogspot.com is a feed you have subscribed to.
Yes, I know that port 443 is commonly used for https connections.
I wasn't aware, or hadn't expected, feeds to use https... after all, confidential data is not typically carried by RSS feeds.
Other people (caring about privacy, deep packet inspection, censorship, …) believe that every web traffic should be encrypted because no one except you needs to know what you are reading/watching/listening/browsing/…