Created attachment 797505 [details] sync-abort-unknown-exception.txt I can no longer sync between Android and desktop. adb log shows some "Unknown exception"'s and aborted syncs. Syncing between desktop versions still works, and adding a new device to a sync account by pairing via Android also works. Pairing between a clean desktop Firefox profile and a clean release Android version. In some previous (failed) pairings, I've also seen "Unknown sync status: 3" but that's not in the attached logs.
W/FxSync(32331): firefox :: GlobalSession :: Aborting sync: Aborting sync because of backoff of 43200000 milliseconds. Server maintenance right now due to capacity work.