Hi! We have Exchange 2003 on a Windows 2003 server. We have big problem with OWA. When connecting from IE for testing, we are > getting error " A System error has occurred while processing your request. > Please try again. If the problem persists, contact your administrator." > after the authentication prompt and after successfully authenticated. > > - Have Exchange 2003 / SP1 / ASP.NET with device update 4.0 / No Frontend > server / Form based Authentication. OWA works without any problems. > > - Have exactly applied KB 817379: Doesn't make any difference > > - Getting an error in the application log: MSExchangeOMA / Category (1000) / > Event Id 1503. > An unknown error occurred while processing the current request: > Message: The remote server returned an error: (501) Not Implemented. > Source: Microsoft.Exchange.OMA.ExchangeDataProvider > Stack trace: > at > Microsoft.Exchange.OMA.ExchangeDataProvider.OmaWebRequest.GetRequestStream() > at > Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeServices.GetSpecialFolders() > at > Microsoft.Exchange.OMA.ExchangeDataProvider.ExchangeServices..ctor(UserInfo > user) > Message: Exception has been thrown by the target of an invocation. > Source: mscorlib > Stack trace: > at System.Reflection.RuntimeConstructorInfo.InternalInvoke(BindingFlags > invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean > isBinderDefault) > at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags > invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) > at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder > binder, Object[] args, CultureInfo culture, Object[] activationAttributes) > at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, > Binder binder, Object[] args, CultureInfo culture, Object[] > activationAttributes) > at Microsoft.Exchange.OMA.UserInterface.Global.Session_Start(Object > sender, EventArgs e) > Message: Exception of type > Microsoft.Exchange.OMA.DataProviderInterface.ProviderException was thrown. > EventMessage: > UserMessage: A System error has occurred while processing your request. > Please try again. If the problem persists, contact your administrator. > Source: Microsoft.Exchange.OMA.UserInterface > Stack trace: > at Microsoft.Exchange.OMA.UserInterface.Global.Session_Start(Object > sender, EventArgs e) > at System.Web.SessionState.SessionStateModule.CompleteAcquireState() > at System.Web.SessionState.SessionStateModule.BeginAcquireState(Object > source, EventArgs e, AsyncCallback cb, Object extraData) > at > System.Web.AsyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute() > at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& > completedSynchronously) PLEASE HELP!!! Mustafa