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Old 01-03-2018, 06:52 AM   #2
chaley
Grand Sorcerer
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Posts: 12,450
Karma: 8012886
Join Date: Jan 2010
Location: Notts, England
Device: Kobo Libra 2
Looking at calibre log I see:
  • Calibre connects successfully to the wireless device network socket.
  • Calibre did not see any attempt to connect on that socket.
  • Calibre did not see any "are you there" broadcasts.

Looking at the CC log I see:
  • CC "sees" calibre's MDNS (bonjour) advertisements.
  • Sometimes when connecting, CC "sees" multiple bonjour advertisements. This shouldn't happen. Do you have multiple instances of calibre running?
  • Starting at 2018-01-03 09:25:32, CC sees calibre's wireless device UDP broadcast response but fails to connect (TCP) to the supplied IP address. This strongly implies a firewall problem.
  • Some connection attempts fail with "no route to host". Others fail with a timeout. I don't know why that would happen.

Given the above, all I can say with certainty is that something is preventing CC from connecting to calibre. Exactly what the "something" is I cannot say, but it "smells" like a firewall somewhere.

Questions:
  • Are TCP connections to port 9091 allowed through your firewall?
  • Does your home router have any filtering set up?
  • What happens if you turn off the content server in calibre then change the WD port to 8080?
  • Do you have any intrusion detection software running on your Linux box?
  • I note from your tcpdump that port 9091 is identified as xmltec-xmlmail. Do you have any sort of auto-start based on port numbers? What happens if you set the calibre WD port to something bizarre (and unassigned) such as 14802?
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