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why can't I open a port on Win 7? is it the app's fault?

I am having problems opening a port from one Windows PC on my local network. On Windows 7 computer ("Computer A") I running Calibre, an ebook management program that has something called an "ebook ...
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what is ip 10.1.1.130 to which seems monitored by NT Kernel & System process on Windows 7?

I used netstat to see what is happening with network connections, and I see this weird ip address somehow listed together with PID 4 "NT Kernel & System", whatever that might be. Netstat describes ...