That debug log says that some other program is using one of CC's network ports. This is very unusual. It could be that some piece of an old calibre instance is still running, or it could be that some antivirus is blocking that port. It also says that CC was able to ask calibre if it is there, so the wireless network is working.
I suggest that you reboot both the computer running calibre and the Fire. If that doesn't fix it then send me a CC debug log by going to CC's Settings / Other / Send a debug log to MultiPie.
NB: It is very hard to know whether something changed because antivirus programs update themselves silently.
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