I have a big problem with Firefox Sync on my Windows laptop. I constantly get the following error: "Sync encountered an error while synchronising: Unknown error. Sync will automatically retry this action."
The error has always been there since I've set up Sync on Firefox on that computer.
Looking at "about: sync-log" revealed that the issue is with the bookmarks syncing engine. Here are the relevant lines from the log:
1351062615899 Sync.Engine.Bookmarks DEBUG First sync, uploading all items
1351062616754 Sync.Store.Bookmarks DEBUG No node for GUID mobile; returning no children.
1351062616755 Sync.Engine.Bookmarks INFO 1122 outgoing items pre-reconciliation
1351062616791 Sync.Status DEBUG Status for engine bookmarks: error.engine.reason.unknown_fail
I've tried cleaning the sync data on the server, and "Reset Sync" various times, to no avail. Syncing add-ons and passwords works fine (I don't sync anything else). Please help! Syncing bookmarks is the main reason I'm using Sync at all!