Please make sure of the following: *Are you on the recent version of sync? * Are there any Firewalls or antiviruses that might be stopping a connection made to sync servers? *Are you blocking any storage in the Firefox profile? Please see: [[Firefox Sync troubleshooting and tips]] * How do I turn on sync logs: # Open about:config and turn on: services.sync.log.appender.file.logOnSuccess and services.sync.log.logger.engine.bookmarks # Restart Firefox and look at: about:sync-log # Logs and error messages will be located here Please also use pastebin.mozilla.org for sharring any errors that relate to this issue. Thank you.