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I set up Google Calendar to sync with Lightning in Thunderbird. It has worked well for the last few weeks. It has now suddenly stopped working. I have checked the CalDAV addresses and they are all still ok. I do not know if my recent addition of syncing my new Android phone with the Google Calendar has anything to do with it, or just a coincidence.

When Thunderbird tries to sync, it asks for the username and password. I enter these for the Google Calendar, and end up in a continuous circle.

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You mean, it keeps asking you for the password? What system are you using? Can you log-in over web normally? Is there any error which appears? If you using Linux, can you run Thunderbird from the Terminal and see if there are any errors? –  kenorb Jul 29 '12 at 13:27
    
Yes, it continually asks to enter the user name and password. I am currently logged into Win7, can give Ubuntu a go when I am able to reset my system (I have processes running I cannot interrupt). I can log into Google Calendar via the web interface with no problem. I do not get any error messages - just keeps asking to confirm the login. –  Andrew Heath Jul 30 '12 at 13:02
    
Check the Thunderbird error log file, see: wiki.mozilla.org/MailNews:Logging#Windows and paste the errors. Otherwise it's just a guessing. –  kenorb Jul 31 '12 at 0:57
    
0[1a0f140]: autosync paused –  Andrew Heath Jul 31 '12 at 9:13
    
Which version of Thunderbird do you have? –  kenorb Jul 31 '12 at 20:11

3 Answers 3

up vote 1 down vote accepted

FWIW: for the past few days I've been getting semi-frequent (3-4 times per day) occurrences of OS X Calendar/iCal and a third-party product, Fantastical, throwing errors that my password was not accepted. The folks at Flexibits (Fantastical) inform me that they're seeing a wave of similar reports.

So, it would appear that something's wrong on Google's end. I found this thread when search for other reports of the problem.

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Opened Thunderbird today with no errors. Must have been Google! I'll blame them anyway. –  Andrew Heath Aug 4 '12 at 13:08

I had the same problem after setting up my new Android phone. In my case, I think the problem was related to the fact that I had to add a Gmail account to my Google account to be able to use my android device, instead of using the non-Google address as login that I used before to setup the calendar. My username for accessing the calendar was therefore changed as a result of this process (note that it is still the same account). I can login with my new (Gmail) username, but Thunderbird says that calendar is temporarily unavailable.

The solution was to replace the username in my CALDAV address:

https://www.google.com/calendar/dav/[old non-google email adress username]/events

with

https://www.google.com/calendar/dav/[gmail address]/events

After that it worked and I could also see my old events added under the previous user name again.

P.S. I couldn't directly change the CALDAV address, but I had to add a new calendar and remove the old one.

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Can you check if you the latest version of Thunderbird?

Here is how you should run Thunderbird to generate the log file specifically for synchronization issues:

c:\>set NSPR_LOG_MODULES=ImapAutoSync:4
c:\>set NSPR_LOG_FILE=c:\LogFile.log
c:\>"C:\Program Files\Mozilla Thunderbird\thunderbird.exe"

Possibly this could be one of the following bugs:

https://bugzilla.mozilla.org/show_bug.cgi?id=589310

https://bugzilla.mozilla.org/show_bug.cgi?id=533257

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