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Hmm I don't know what happened with that log. I'll resend.
Here's how I know it's not a network or firewall problem: this morning for example, I connected via Wireless Connection, it all went fine; I hit Disconnect in CC; disconnected fine; I hit Connect a few seconds later; nothing connects. Given that absolutely nothing changed in those few seconds, it would seem to rule out network/firewall.
Also, network/firewall was my first stop when I noticed this a few months ago so I did some of my own debugging, like turning off my firewall and AV then trying to connect, installing Calibre on a different machine (including a Linux VM I was running), trying to connect from LTE rather than my LAN, trying on the 5Ghz band rather than the 2.4, etc. I mercifully don't experience neighbor Wifi interference and the computer Calibre is on, FWIW, is wired. The Android devices I use are all different versions - Gingerbread, Kitkat, and Marshamallow, which would seem to rule out something Android-version-specific.
Finally, since the only sometimes-solution is to restart Calibre, that would also seem to rule out network/firewall since as Calibre restart doesn't change either of those.
And I guess the final thing that would seem to rule out network/firewall is that it was all running great up until a few months ago and nothing has changed in my network or firewall, so same machine, same network, same firewall settings (and yes double-checked those) and now intermittent Wireless Connection is what made me conclude that problem lies with either CC or Calibre rather than the setup in my home.
I'll email you the logs you asked for and hopefully they'll point in a direction. Thanks.
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