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When you open a command prompt and type ipconfig /all and hit enter, what does it show for the network adapters and their associated addresses?
Is another application already using the port & socket? Something like netstat -aon | findstr 9099 from a CLI session can help with this (substiture the port you are using with calibre for the 9099. You can use the PID at the end of the line to locate the other program if it shows.
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