Intermittently a specific customer is getting the error below after click Run to run a test in Test Studio on FireFox version 37.0.2. The customer just clicks Run a second time and it may or may not happen. I am unable to reproduce the problem and we cannot get direct access to his application. ------------------------------------------------------------ '30.04.2015 16:16:32' - Executing test: 'IBN_Test_20150423_11h40', path: 'IBN_Test_20150423_11h40.tstest.' '30.04.2015 16:16:32' - Using .Net Runtime version: '4.0.30319.18444' for test execution. Build version is '2015.1.319.0'. '30.04.2015 16:16:32' - Starting execution.... '30.04.2015 16:16:39' - Failure detected during execution. Details: ------------------------------------------------------------ '30.04.2015 16:16:39' - System.ServiceModel.EndpointNotFoundException: There was no endpoint listening at net.pipe://localhost/Telerik/TestingFramework.Hosts.Manager that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details. ---> System.IO.PipeException: The pipe endpoint 'net.pipe://localhost/Telerik/TestingFramework.Hosts.Manager' could not be found on your local machine. --- End of inner exception stack trace --- Server stack trace: at System.ServiceModel.Channels.PipeConnectionInitiator.GetPipeName(Uri uri, IPipeTransportFactorySettings transportFactorySettings) at System.ServiceModel.Channels.NamedPipeConnectionPoolRegistry.NamedPipeConnectionPool.GetPoolKey(EndpointAddress address, Uri via) at System.ServiceModel.Channels.CommunicationPool`2.TakeConnection(EndpointAddress address, Uri via, TimeSpan timeout, TKey& key) at System.ServiceModel.Channels.ConnectionPoolHelper.EstablishConnection(TimeSpan timeout) at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.OnOpen(TimeSpan timeout) at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout) at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannel.CallOpenOnce.System.ServiceModel.Channels.ServiceChannel.ICallOnce.Call(ServiceChannel channel, TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannel.CallOnceManager.CallOnce(TimeSpan timeout, CallOnceManager cascade) at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout) at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation) at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Telerik.TestingFramework.Hosts.Common.IWebSocketHost.RegisterListener(Int32 pid) at ArtOfTest.WebAii.Messaging.Process.HostsProxy.Start() at ArtOfTest.WebAii.Messaging.Process.HostsProxy.RegisterListener(MessageListener listener) at ArtOfTest.WebAii.Messaging.Process.ExecutionMediator.RegisterManager(Manager manager) at ArtOfTest.WebAii.BrowserSpecialized.Firefox.FireFoxActions.LaunchNewBrowserInstance(ProcessWindowStyle windowStyle, Manager manager) at ArtOfTest.WebAii.Core.Manager.LaunchNewBrowser(BrowserType browserToLaunch, Boolean waitForBrowserToConnect, ProcessWindowStyle windowStyle, String arguments) at ArtOfTest.WebAii.Design.Execution.ExecutionEngine.InitializeWeb(ExecutionEngineCreateParams initParams) at ArtOfTest.WebAii.Design.Execution.TestExecuteProxy.CreateAndInitializeEngine(Test test, ExecutionEngineCreateParams cp) at ArtOfTest.WebAii.Design.Execution.TestExecuteProxy.ExecuteTest(ExecuteTestCommand command) ------------------------------------------------------------ '30.04.2015 16:16:39' - Test completed!