MobileRead Forums - View Single Post - [Android] Calibre & CC No Longer Communicate

chaley · 06-11-2017, 12:31 PM

Given that connections have worked in the past, in the vast majority of cases this problem is caused by security software on the machine running calibre, usually a heavy-handed antivirus package or the firewall. In a small but noticeable number of cases the problem is caused by the home WiFi router.

I suggest that you try the following things to ensure that you have a clean environment.

Shut down the computer running calibre.
Shut down the Android device.
In an abundance of caution, shut down all devices connected to your network. This is not strictly necessary but can help avoid some strange problems.
Reboot the network WiFi router.
Boot the computer running calibre.
Ensure that the wireless device driver is running in calibre (Sharing button, Wireless device is "on").
Boot the device.
Reset CC's wireless device connection settings to their default, removing any fixed IP/port you might have entered.
Try to connect.

If connections still don't work then you will need to look at the AV and firewall settings on the computer running calibre. Calibre should be ignored. Many people have had good luck in finding problems by temporarily turning off the AV/firewall to see if CC can again connect.

One diagnostic is to turn on calibre's content server (Sharing button again) then use the web browser on the device to access it. On the device you would type http://IP-address-of-calibre-computer:8080/ (usually something like http://192.168.number.number:8080). If that doesn't connect then we confirm that your device can't see the calibre computer.

You might also want to ask yourself "what changed?" Did you update your router, the OS of the machine running calibre (such as the Windows Creators Update), the version of the OS on your device, or anything else? Note that Antivirus software usually updates itself silently.

It is almost certain that neither a new CC nor a new calibre version has broken wireless device connections. First, the connection process hasn't changed in a long time in either calibre or CC. Second, tens of thousands of people connect CC to calibre every week using the wireless device. If this didn't work then we would most certainly hear about it.

If you continue to have problems then perhaps debug logs might help us determine why. See our FAQ How do I get help? for information about how to get logs and send them to us.

Good luck,
Charles

06-11-2017, 12:31 PM	#3
chaley Grand Sorcerer Posts: 12,467 Karma: 8025600 Join Date: Jan 2010 Location: Notts, England Device: Kobo Libra 2	Given that connections have worked in the past, in the vast majority of cases this problem is caused by security software on the machine running calibre, usually a heavy-handed antivirus package or the firewall. In a small but noticeable number of cases the problem is caused by the home WiFi router. I suggest that you try the following things to ensure that you have a clean environment. Shut down the computer running calibre. Shut down the Android device. In an abundance of caution, shut down all devices connected to your network. This is not strictly necessary but can help avoid some strange problems. Reboot the network WiFi router. Boot the computer running calibre. Ensure that the wireless device driver is running in calibre (Sharing button, Wireless device is "on"). Boot the device. Reset CC's wireless device connection settings to their default, removing any fixed IP/port you might have entered. Try to connect. If connections still don't work then you will need to look at the AV and firewall settings on the computer running calibre. Calibre should be ignored. Many people have had good luck in finding problems by temporarily turning off the AV/firewall to see if CC can again connect. One diagnostic is to turn on calibre's content server (Sharing button again) then use the web browser on the device to access it. On the device you would type http://IP-address-of-calibre-computer:8080/ (usually something like http://192.168.number.number:8080). If that doesn't connect then we confirm that your device can't see the calibre computer. You might also want to ask yourself "what changed?" Did you update your router, the OS of the machine running calibre (such as the Windows Creators Update), the version of the OS on your device, or anything else? Note that Antivirus software usually updates itself silently. It is almost certain that neither a new CC nor a new calibre version has broken wireless device connections. First, the connection process hasn't changed in a long time in either calibre or CC. Second, tens of thousands of people connect CC to calibre every week using the wireless device. If this didn't work then we would most certainly hear about it. If you continue to have problems then perhaps debug logs might help us determine why. See our FAQ How do I get help? for information about how to get logs and send them to us. Good luck, Charles Last edited by chaley; 06-11-2017 at 01:00 PM.