Several people have reported 403 errors when trying to sync contacts. Some are using two stage authentication, others aren’t. Some use Windows 7, others 8.1. I haven’t been able to recreate it myself.
If you see 403 errors please send me an e-mail with more details on your OS, Thunderbird and gContactSync version, as well as whether you are using a normal Gmail account or a Google Apps account.
Please go here: https://security.google.com/settings/security/activity and let me know if you see anything unusual.
The ClientLogin method gContactSync uses has been deprecated for a while (2012) but Google said they would support it until 2015.
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