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Old 06-28-2008, 11:08 PM   #1
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Question Why does Calibre need to go to the web to convert a zipped HTML file?

I was creating LRF files from a number of zipped up HTML files I have...but Calibre hung unless I let it connect to the web.

What the heck does it need to go out to the internet for? My files are self-contained.
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Old 06-28-2008, 11:48 PM   #2
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It doesn't
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Old 06-29-2008, 01:42 AM   #3
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When I click the button to convert the book, my firewall (ZoneAlarm) tells me Calibre (or, more specifically calibre-parallel.exe) wants to access the internet. If I say "no", Calibre hangs and will not create the book.

If I turn on ZoneAlarm's Internet Lock before clicking on the convert book button, Calibre hangs and will not create the book.

If I disconnect my computer from the internet, and when the firewall asks if Calibre can connect to the internet, I tell it yes, it will try to connect a few times, then convert the book.

It wants to go the web for something. ZoneAlarm says it's trying to go to 127.0.0.1:Port 10013.

[a little later]

Okay, with a little digging, I see that 127.0.0.1 is a "loopback" test back to my own computer. But why does Calibre do that? Is it trying to see if my Sony Reader is attached to the computer?
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Old 06-29-2008, 03:29 AM   #4
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calibre has a parallel processing architecture. Every conversion job is handed off to an independent process. These processes are controlled using TCP/IP networking. i.e. the GUI starts a server that controls these worker processes. The server runs on your computer as do the worker processes, and they talk to each other, but only on your computer.
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Old 06-30-2008, 01:51 AM   #5
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Thanks for the explanation.
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