This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Sync encounters an unknown error everytime I try to sync

  • 1 cavab
  • 16 have this problem
  • 1 view
  • Last reply by ben_b

more options

Firefox Sync stopped working all of a sudden. It always says "Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action." I've retried many many times. I even deactivated my Desktop account and then added it again in Sync. I keep getting the same error. I am running Firefox 4.0.1

Firefox Sync stopped working all of a sudden. It always says "Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action." I've retried many many times. I even deactivated my Desktop account and then added it again in Sync. I keep getting the same error. I am running Firefox 4.0.1

All Replies (1)

more options

I think I fixed this.

Go to your sync account, log in, and click clear your sync data. Then click the Sync now button on the error message.

The error went away for me.