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I had the same symptoms when running regular Calibre GUI on Ubuntu 19.10, through which I enabled the content server or wireless device connection. My Calibre-connect, running on an Android tab, could not connect to either, no matter what settings I tried (eg. automatic connection versus specified IP address/port)
The fix was to DISABLE Ubuntu's built-in firewall:
sudo ufw disable
This turns off the firewall AND prevents it restarting on next boot. You might want to do something more subtle, or just manually turn it back on again when you are finished transferring books.
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