Hi all!

I implemented a multi-server installation with six zimbra mailbox servers. Since the deploy (Aug'11), I've experienced the following issue: when reminders of past-due meetings of a shared calendar is declined, an error message "no such account exists" is displayed. For instance:

Code:
No such account exists
method:	[unknown]
msg:	no such account: cd79627714-6097-487b-8c25-74b8cd3c4d50
code:	account.NO_SUCH_ACCOUNT
detail:	soap:Sender
trace:	com.zimbra.cs.account.AccountServiceException: no such account: 79627714-6097-487b-8c25-74b8cd3c4d50 ExceptionId:btpool0-
1922://correio.mydomain.com.br/service/soap/DismissCalendarItemAlarmRequest:1342806439932:928d26a01483fe6a Code:account.NO_SUCH_ACCOUNT at 
com.zimbra.cs.account.AccountServiceException.NO_SUCH_ACCOUNT(AccountServiceException.java:187) at 
com.zimbra.cs.service.mail.DismissCalendarItemAlarm.handle(DismissCalendarItemAlarm.java:82) at 
com.zimbra.soap.SoapEngine.dispatchRequest(SoapEngine.java:412) at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:287) at 
com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:158) at com.zimbra.soap.SoapServlet.doWork(SoapServlet.java:294) at 
com.zimbra.soap.SoapServlet.doPost(SoapServlet.java:215) at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) at 
com.zimbra.cs.servlet.ZimbraServlet.service(ZimbraServlet.java:208) at javax.servlet.http.HttpServlet.service(HttpServlet.java:814) at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at 
com.zimbra.cs.servlet.SetHeaderFilter.doFilter(SetHeaderFilter.java:79) at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at 
org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81) at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:132) at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:218) at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) at 
org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:422) at 
org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230) at 
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114) at
 org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.handler.rewrite.RewriteHandler.handle(RewriteHandler.java:230) at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.handler.DebugHandler.handle(DebugHandler.java:77) at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:326) at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:583) at 
org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:986) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756) at 
org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:414) at 
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:429) at 
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)
request:	

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><userAgent xmlns="" 
name="ZimbraWebClient - FF3.0 (Linux)" version="7.1.3_GA_3346"/><session xmlns="" id="148809"/><notify xmlns="" seq="2"/><account xmlns="" 
by="name">user.account@mydomain.com.br</account><format xmlns="" type="js"/><authToken 
xmlns="">0_9ad3dec9dca6dae3f327f98f4bbf6f20da271393_69643d33363a32366161343438612d303265302d343634352d396533662d626365343938373831
6665663b6578703d31333a313334323830393936363834363b6169643d33363a39663839316464652d376533322d346266662d613631652d363937303139336
1653034303b747970653d363a7a696d6272613b</authToken></context></soap:Header><soap:Body><DismissCalendarItemAlarmRequest 
xmlns="urn:zimbraMail"><appt xmlns="" id="79627714-6097-487b-8c25-74b8cd3c4d50:1519" dismissedAt="1342806474319"/><appt xmlns="" 
id="79627714-6097-487b-8c25-74b8cd3c4d50:1517" dismissedAt="1342806474319"/></DismissCalendarItemAlarmRequest></soap:Body>
</soap:Envelope>
Below is another example, with differnt user and andshared calendar, but now is a slice of mailbox.log file:

Code:
2012-07-20 19:44:39,821 INFO  [btpool0-2603://correio.mydomain.com.br/service/soap/DismissCalendarItemAlarmRequest]
 [name=user.account@mydomain.com.br;aname=admin@mydomain.com.br;mid=9;ip=200.202.168.177;ua=ZimbraWebClient - FF3.0 (Linux)/7.1.3_GA_3346;] soap - DismissCalendarItemAlarmRequest
2012-07-20 19:44:39,822 INFO  [btpool0-2603://correio.mydomain.com.br/service/soap/DismissCalendarItemAlarmRequest] 
[name=user.account@mydomain.com.br;aname=admin@mydomain.com.br;mid=9;ip=200.202.168.177;ua=ZimbraWebClient - FF3.0 
(Linux)/7.1.3_GA_3346;] misc - delegated access: doc=DismissCalendarItemAlarm, delegating account=admin@mydomain.com.br, authenticated 
account=user.account@mydomain.com.br, target account=user.account@mydomain.com.br
2012-07-20 19:44:39,822 INFO  [btpool0-2603://correio.mydomain.com.br/service/soap/DismissCalendarItemAlarmRequest] 
[name=user.account@mydomain.com.br;aname=admin@mydomain.com.br;mid=9;ip=200.202.168.177;ua=ZimbraWebClient - FF3.0 
(Linux)/7.1.3_GA_3346;] calendar - <DismissCalendarItemAlarm> id=e0cc16d8-d1d4-4de0-a6a8-3a1c92b7f18c:9972, at=1342824314235
2012-07-20 19:44:39,822 INFO  [btpool0-2603://correio.mydomain.com.br/service/soap/DismissCalendarItemAlarmRequest] 
[name=user.account@mydomain.com.br;aname=admin@mydomain.com.br;mid=9;ip=200.202.168.177;ua=ZimbraWebClient - FF3.0 
(Linux)/7.1.3_GA_3346;] SoapEngine - handler exception
com.zimbra.cs.account.AccountServiceException: no such account: e0cc16d8-d1d4-4de0-a6a8-3a1c92b7f18c
ExceptionId:btpool0-2603://correio.mydomain.com.br/service/soap/DismissCalendarItemAlarmRequest:1342824279822:b329108647d5327e
Code:account.NO_SUCH_ACCOUNT
	at com.zimbra.cs.account.AccountServiceException.NO_SUCH_ACCOUNT(AccountServiceException.java:187)
	at com.zimbra.cs.service.mail.DismissCalendarItemAlarm.handle(DismissCalendarItemAlarm.java:82)
	at com.zimbra.soap.SoapEngine.dispatchRequest(SoapEngine.java:412)
	at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:287)
	at com.zimbra.soap.SoapEngine.dispatch(SoapEngine.java:158)
	at com.zimbra.soap.SoapServlet.doWork(SoapServlet.java:294)
	at com.zimbra.soap.SoapServlet.doPost(SoapServlet.java:215)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	at com.zimbra.cs.servlet.ZimbraServlet.service(ZimbraServlet.java:208)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:814)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
	at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(SetHeaderFilter.java:79)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
	at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:132)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:218)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:422)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.handler.rewrite.RewriteHandler.handle(RewriteHandler.java:230)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.handler.DebugHandler.handle(DebugHandler.java:77)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:326)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:583)
	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:986)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:414)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:429)
	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:451)

Can anybody help me to debug and solve it?
Thanks in advance.

Rommel Oliveira