We have a client access/hub transport server with a CCR mailbox cluster and have recently update from SP1 with update rollup 8 to SP2 with update rollup 2. The upgrade process went fine with no errors. Following the update we are unable to access OWA or use active sync when on one of the CCR nodes. When users attempt to use OWA they get to the form based authentication page, but after logging in get a 503 error. When on the other node OWA and Active Sync work fine. I have verified connectivity between all three servers and have unistalled update rollup 2, reinstalled SP2, and then reinstalled update rollup 2 on the CCR node that doesn't let OWA work with no change to the problem. The BPA doesn't show any issues of note either. In a fit of late night troubleshooting I left by browser session at the 503 error screen and failed over the cluster. Once complete a refresh of the page brought up my mailbox in OWA. Failing back to the other node and refreshing left my session up and working. However once I logged of and back on (still on the funky node) I hit the 503 error again.

Any errors in the event logs of the CAS or MBX server?

On the CA server I get... Event Type: Warning Event Source: MSExchange ActiveSync Event Category: Requests Event ID: 1022 Date: 2/22/2010 Time: 10:45:02 PM User: N/A Computer: EXCAHU01JOW Description: The connection between the Client Access server and Mailbox server "VEXMBXJOW.goodwillsew.com" failed. If this event is logged infrequently or only during scheduled downtime for a Mailbox server, no user action is required. If this event occurs repeatedly, check network connectivity using PING or PingPath. Also, check connectivity using the Test-ActiveSyncConnectivity cmdlet. More information: Microsoft.Exchange.Data.Storage.ConnectionFailedTransientException: Cannot open mailbox /o=Goodwill Industries of SE WI/ou=First Administrative Group/cn=Recipients/cn=mayres. ---> Microsoft.Mapi.MapiExceptionNetworkError: MapiExceptionNetworkError: Unable to make connection to the server. (hr=0x80040115, ec=-2147221227) Diagnostic context: ...... Lid: 10648 dwParam: 0x6D9 Msg: EEInfo: Generating component: 2 Lid: 14744 dwParam: 0x6D9 Msg: EEInfo: Status: 1753 Lid: 9624 dwParam: 0x6D9 Msg: EEInfo: Detection location: 501 Lid: 13720 dwParam: 0x6D9 Msg: EEInfo: Flags: 0 Lid: 11672 dwParam: 0x6D9 Msg: EEInfo: NumberOfParameters: 4 Lid: 8856 dwParam: 0x6D9 Msg: EEInfo: prm[0]: Unicode string: ncacn_ip_tcp Lid: 8856 dwParam: 0x6D9 Msg: EEInfo: prm[1]: Unicode string: VEXMBXJOW.goodwillsew.com Lid: 12952 dwParam: 0x6D9 Msg: EEInfo: prm[2]: Long val: -1527653632 Lid: 15000 dwParam: 0x6D9 Msg: EEInfo: prm[3]: Pointer val: 0x000000000682CF50 Lid: 19778 Lid: 27970 StoreEc: 0x80040115 Lid: 17730 Lid: 25922 StoreEc: 0x80040115 at Microsoft.Mapi.MapiExceptionHelper.ThrowIfError(String message, Int32 hresult, Int32 ec, DiagnosticContext diagCtx) at Microsoft.Mapi.ExRpcConnection.Create(ConnectionCache connectionCache, ExRpcConnectionCreateFlag createFlags, ConnectFlag connectFlags, String serverDn, String userDn, String user, String domain, String password, String httpProxyServerName, Int32 ulConMod, Int32 lcidString, Int32 lcidSort, Int32 cpid, Int32 cReconnectIntervalInMins, Int32 cbRpcBufferSize, Int32 cbAuxBufferSize) at Microsoft.Mapi.ConnectionCache.OpenMapiStore(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, ClientIdentityInfo clientIdentity, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) at Microsoft.Mapi.ConnectionCache.OpenMailbox(String mailboxDn, Guid mailboxGuid, Guid mdbGuid, WindowsIdentity windowsIdentityAs, String userDnAs, OpenStoreFlag openStoreFlags, CultureInfo cultureInfo, String applicationId) at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) --- End of inner exception stack trace --- at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString, Boolean secondTry) at Microsoft.Exchange.Data.Storage.ConnectionCachePool.OpenMailbox(String serverDn, String userDn, String mailboxDn, Guid mailboxGuid, Guid mdbGuid, Object identity, ConnectFlag connectFlag, OpenStoreFlag openStoreFlag, CultureInfo cultureInfo, String clientInfoString) at Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(LogonType logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object identity, OpenMailboxSessionFlags flags) at Microsoft.Exchange.Data.Storage.MailboxSession.CreateMailboxSession(LogonType logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object identity, OpenMailboxSessionFlags flags, CultureInfo cultureInfo, String clientInfoString) at Microsoft.Exchange.Data.Storage.MailboxSession.Open(ExchangePrincipal mailboxOwner, WindowsPrincipal authenticatedUser, CultureInfo cultureInfo, String clientInfoString) at Microsoft.Exchange.AirSync.Command.OpenMailboxSession(AirSyncUser user) at Microsoft.Exchange.AirSync.Command.WorkerThread() For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Event Type: Error Event Source: MSExchange ActiveSync Event Category: Server Event ID: 1016 Date: 2/22/2010 Time: 10:45:07 PM User: N/A Computer: EXCAHU01JOW Description: Exchange ActiveSync has encountered repeated failures when it tries to access data on Mailbox server [VEXMBXJOW.goodwillsew.com]. Exchange ActiveSync will temporarily stop making Exchange ActiveSync requests to the Mailbox server. The process will be postponed for [60] seconds. This may be caused if the Mailbox server is overloaded. If this event is frequently logged, review the Application log for other events that could indicate the root cause of performance problems on the Mailbox server specified in the event description. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. The only error of note on the Mailbox server was Event Type: Error Event Source: MSExchangeIS Event Category: General Event ID: 1125 Date: 2/22/2010 Time: 10:44:52 PM User: N/A Computer: EXMBX02JOW Description: Error 0x482 performing register backup. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 5b 44 49 41 47 5f 43 54 [DIAG_CT 0008: 58 5d 00 00 16 00 00 00 X]...... 0010: ff 38 04 00 00 00 00 00 ÿ8...... 0018: 00 02 08 00 00 00 09 b1 .......± 0020: 40 10 82 04 00 00 @.‚...

Hi,First please check if you can use Outlook send/recieve email.Please try to use get-storagegroupcopystatus |fl to check the status of the database.Please try to use Fiddler(http://www.fiddler2.com/fiddler2/version.asp) to troubleshoot the issue.Configuring clientshttp://www.fiddlertool.com/Fiddler/help/hookup.asp#Q-ConfigureApp Regards, Xiu