Hi everyone, Since today, I cannot get Firefox to synchronize my bookmarks on one of my computers. I still can send a tab from this computer to others and vice versa though. Here is an exemple of sync log: 1598260143111 Sync.LogManager DEBUG Flushing file log 1598260143122 Sync.LogManager DEBUG Log cleanup threshold time: 1597396143122 1598260143132 Sync.LogManager DEBUG Done deleting files. 1598260144429 FirefoxAccounts INFO Polling device commands. 1598260144429 Sync.Service DEBUG User-Agent: Firefox/79.0 (Windows NT 10.0; Win64; x64) FxSync/1.81.0.20200720193547.desktop 1598260144429 Sync.Service INFO Starting sync at 2020-08-24 11:09:04 in browser session 8pd4DSAYP9NP 1598260144429 Sync.Service DEBUG In sync: should login. 1598260144430 Sync.Service INFO User logged in successfully - verifying login. 1598260144430 FirefoxAccounts TRACE not checking freshness of profile as it remains recent 1598260144431 Sync.BrowserIDManager DEBUG unlockAndVerifyAuthState already has (or can fetch) sync keys 1598260144431 Sync.Status DEBUG Status.login: error.sync.reason.serverMaintenance => success.status_ok 1598260144431 Sync.Status DEBUG Status.service: error.login.failed => error.login.failed 1598260144431 Sync.Service DEBUG Fetching unlocked auth state returned success.status_ok 1598260144431 FirefoxAccounts TRACE not checking freshness of profile as it remains recent 1598260144437 Services.Common.RESTRequest DEBUG GET request to https://api.accounts.firefox.com/v1/account/device/commands?index=15967270 1598260144611 Sync.Resource DEBUG GET fail 503 https://sync-600-us-west-2.sync.services.mozilla.com/1.5/92612799/info/collections 1598260144611 Sync.Resource WARN GET request to https://sync-600-us-west-2.sync.services.mozilla.com/1.5/92612799/info/collections failed with status 503 1598260144611 Sync.Status DEBUG Status.login: success.status_ok => error.login.reason.server 1598260144611 Sync.Status DEBUG Status.service: error.login.failed => error.login.failed 1598260144611 Sync.ErrorHandler DEBUG Got Retry-After: 3600 1598260144611 Sync.Status DEBUG Status.login: error.login.reason.server => error.sync.reason.serverMaintenance 1598260144611 Sync.Status DEBUG Status.service: error.login.failed => error.login.failed 1598260144611 Sync.SyncScheduler DEBUG Got backoff notification: 3600000ms 1598260144611 Sync.SyncScheduler DEBUG Fuzzed minimum next sync: 1598263744611 1598260144612 Sync.ErrorHandler ERROR Sync encountered a login error 1598260144612 Sync.SyncScheduler DEBUG Clearing sync triggers and the global score. 1598260144613 Sync.SyncScheduler DEBUG Next sync in 4413803.3495770125 ms. (why=schedule) 1598260144614 Sync.Service DEBUG Exception calling WrappedLock: Error: Login failed: error.sync.reason.serverMaintenance(resource://services-sync/service.js:1043:15) JS Stack trace: onNotify@service.js:1043:15 1598260144614 Sync.Service DEBUG Not syncing: login returned false. 1598260144614 FirefoxAccounts TRACE not checking freshness of profile as it remains recent Many thanks in advance for your help. Any advice most welcome. Regards, Renaud