Tickets :: Comment on [#12339] PING-SYNC storm in ActiveSync is back

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Comment	> >> Attached.maybe the following is the report of the problem? >> >> ERR: Unknown message. > > Bug: 12316 > >> Now that I've enabled per-device sync logging, I can see something >> else. My Android is blocking on this error (I guess), > > This is happening because, for some reason you are getting UIDs back > from your IMAP server that are lower than the minimum UID received in > the initial sync. No idea why this is happening at this point. My > guess is that the UIDs are no longer valid (UIDVALIDITY changed), but > I'm waiting for someone to test those changes. > >> but the traffic >> storm I'm seeing is actually from my Outlook 2013 - it's log file is >> huge and growing by megabytes per minute (60,100 lines per minute). >> However, email seems to be in sync - it's simply continually >> checking? > > Yes, that's how ActiveSync works. The difference with Outlook is that > it syncs EVERY email folder COMPLETELY and pushes every folder, > whereas android, by default, only pushes INBOX. Now, if it's actually > issuing continuous SYNC requests (and not looping within the single > SYNC request) then that is a problem. > >> I have set "forcedheartbeat" in an attempt to slow down >> Outlook - but even after a restart doesn't seem to have any effect > > This setting is simply the time that each PING or SYNC request lasts > before initiating another one, so you will still see the checks. If > you want to reduce the number of actual checks performed during each > heartbeat you should increase the 'waitinterval' setting. This will > cause the server to wait longer between backend checks. Of course, > this also means it will be longer before the change is detected and > therefore longer to be pushed to the device. > >> I'm guessing there's a corrupt email that causes Android to fault and >> stop, > > Not a corrupt email, but unexpected (or unexplained) email UIDs being > received from the imap client. > >> whereas Outlook gets past it but then goes back to re-check and >> ends up looping? > > No idea how Outllook is getting past this. A log from Outlook would > possibly be helpful as well.
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