Zimbra desktop unable to fully synch with an IMAP server

[Ash-Fox]

Zimbra desktop seems to be unable to completely synch with my mail server, I suspect the problem might have to do with the fact the folder it errors on has a lot of e-mails.

The error Zimbra outputs:

Debug message: Request already pending

Exception:

com.zimbra.common.service.ServiceException: system failure: Synchronization of folder 'Archive' failed
ExceptionId:mid=7:1244159615408:dc0f442fe71c1a2e
Code:service.FAILURE
	at com.zimbra.common.service.ServiceException.FAILURE(ServiceException.java:253)
	at com.zimbra.cs.datasource.ImapSync.syncFailed(ImapSync.java:298)
	at com.zimbra.cs.datasource.ImapSync.syncRemoteFolders(ImapSync.java:221)
	at com.zimbra.cs.datasource.ImapSync.syncFolders(ImapSync.java:193)
	at com.zimbra.cs.datasource.ImapSync.importData(ImapSync.java:152)
	at com.zimbra.cs.offline.OfflineImport.importData(OfflineImport.java:88)
	at com.zimbra.cs.datasource.DataSourceManager.importData(DataSourceManager.java:154)
	at com.zimbra.cs.mailbox.LocalMailbox.importData(LocalMailbox.java:417)
	at com.zimbra.cs.mailbox.LocalMailbox.syncAllLocalDataSources(LocalMailbox.java:389)
	at com.zimbra.cs.mailbox.LocalMailbox.sync(LocalMailbox.java:431)
	at com.zimbra.cs.mailbox.LocalMailbox.syncOnTimer(LocalMailbox.java:361)
	at com.zimbra.cs.mailbox.DesktopMailbox$1.run(DesktopMailbox.java:437)
	at java.util.TimerThread.mainLoop(Unknown Source)
	at java.util.TimerThread.run(Unknown Source)
Caused by: java.lang.IllegalStateException: Request already pending
	at com.zimbra.cs.mailclient.imap.ImapConnection.sendRequest(ImapConnection.java:462)
	at com.zimbra.cs.mailclient.imap.ImapRequest.send(ImapRequest.java:77)
	at com.zimbra.cs.mailclient.imap.ImapRequest.sendCheckStatus(ImapRequest.java:81)
	at com.zimbra.cs.mailclient.imap.ImapConnection.doSelectOrExamine(ImapConnection.java:187)
	at com.zimbra.cs.mailclient.imap.ImapConnection.select(ImapConnection.java:174)
	at com.zimbra.cs.datasource.RemoteFolder.select(RemoteFolder.java:236)
	at com.zimbra.cs.datasource.ImapFolderSync.createLocalFolder(ImapFolderSync.java:511)
	at com.zimbra.cs.datasource.ImapFolderSync.syncFolder(ImapFolderSync.java:125)
	at com.zimbra.cs.datasource.ImapSync.syncRemoteFolders(ImapSync.java:216)
	... 11 more

If issue persists please post description and debug information here.

Because the forum whines about me quoting the mail server log, I've included it instead as an attachment. It will show when Zimbra desktop initially added the account and the attempt to synchronize after.

Additional attempts at synchronisation result in the same behaviour.

[Ash-Fox]

I've added this on bugzilla:

Bug 38521 – IMAP synchronisation issues