OWA inconsistently fails

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    Hi there
    For months now I have been running OWA no problem on a server, but recently it started giving error message 1503. During my testing of the problem I can access OWA a few times (no more than 5) and then the next time it gives the error: A System error has occurred while processing your request. Please try again. If the problem persists, contact your administrator … with the event id logged in the app log.

    If i restart IIS it works fine for a few logons and then crashes again. I have tried changing the virtual folder to exchange-oma as well but to no avail

    please help
    Event Type: Error
    Event Source: MSExchangeOMA
    Event Category: (1000)
    Event ID: 1503
    Date: 4/30/2008
    Time: 6:57:30 AM
    User: N/A
    Computer: CTSERVER01
    An unknown error occurred while processing the current request:
    Message: Object reference not set to an instance of an object.
    Source: System
    Stack trace:
    at System.Net.OSSOCK.recv(IntPtr socketHandle, IntPtr pinnedBuffer, Int32 len, SocketFlags socketFlags)
    at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)

    Message: Unable to read data from the transport connection.
    Source: System
    Stack trace:
    at System.Net.ConnectStream.BeginRead(Byte[] buffer, Int32 offset, Int32 size, AsyncCallback callback, Object state)
    at System.Net.ConnectStream.Read(Byte[] buffer, Int32 offset, Int32 size)
    at System.Xml.XmlStreamReader.Read(Byte[] data, Int32 offset, Int32 length)
    at System.Xml.XmlScanner.Read()
    at System.Xml.XmlScanner.ScanContent()
    at System.Xml.XmlTextReader.ParseRoot()
    at System.Xml.XmlTextReader.Read()
    at Microsoft.Exchange.OMA.ExchangeDataProvider.StaticStuff.ParseDavResponse(Stream response, NewItemDelegate newItem, AddItemDelegate addItem, StatusDelegate handleStatus)
    at Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeItem.PopulateProperties(IList RequestedProperties, Boolean NoPreferences)
    at Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeRootFolder.PopulateProperties(IList RequestedProperties, Boolean NoPreferences)
    at Microsoft.Exchange.OMA.Preferencing.OmaUserInfo.EnsureProperties(IItem item, PropertyEnum[] properties)
    at Microsoft.Exchange.OMA.Preferencing.OmaUserInfo.get_UserCulture()
    at Microsoft.Exchange.OMA.UserInterface.Page.Page_Load(Object sender, EventArgs e)
    at System.Web.UI.Control.OnLoad(EventArgs e)
    at System.Web.UI.MobileControls.MobilePage.OnLoad(EventArgs e)
    at System.Web.UI.Control.LoadRecursive()
    at System.Web.UI.Page.ProcessRequestMain()

    Message: Exception of type System.Web.HttpUnhandledException was thrown.
    Source: System.Web
    Stack trace:
    at System.Web.UI.Page.HandleError(Exception e)
    at System.Web.UI.Page.ProcessRequestMain()
    at System.Web.UI.Page.ProcessRequest()
    at System.Web.UI.Page.ProcessRequest(HttpContext context)
    at System.Web.CallHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute()
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

    For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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