Tests in headless mode stopped working

Hello Telerik Team,

Some time ago my test lists started failing with no steps being executed at all (0 test steps performed in each script). This only happens in headless mode and everything was working all right until the end of last year. The same tests executed in Chrome (browser) mode is finished correctly.

I've already tried creating a new test list, updating the .net framework and redownloading the repository with the tests, but to no avail. Do you know what might be the culprit here? I can provide more information if necessary.

Best regards,

Tomasz

Error:

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'2/28/2022 2:04:17 PM' - Executing test: 'DWOO - Functionality in the Members resources grid(ChromeHeadless)', path: 'Production\DWOO - UI regression\DWOO - Functionality in the Members resources grid.tstest.'
'2/28/2022 2:04:17 PM' - Using .Net Runtime version: '4.0.30319.42000' for test execution. Build version is '2022.1.215.0'.
'2/28/2022 2:04:17 PM' - Starting execution....
'2/28/2022 2:04:18 PM' - Failure detected during execution. Details:
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'2/28/2022 2:04:18 PM' - System.ServiceModel.FaultException: The server was unable to process the request due to an internal error.  For more information about the error, either turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the <serviceDebug> configuration behavior) on the server in order to send the exception information back to the client, or turn on tracing as per the Microsoft .NET Framework SDK documentation and inspect the server trace logs.

Server stack trace: 
   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   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.IBrowserLauncher.LaunchBrowser(ILauncherOptions launchOptions)
   at ArtOfTest.WebAii.Messaging.Process.HostsProxy.LaunchBrowser(ILauncherOptions launcherOptions)
   at ArtOfTest.WebAii.BrowserSpecialized.Chrome.ChromeActions.LaunchCDPManagedBrowser(String startUrl, BrowserType browserType, Boolean windowVisible)
   at ArtOfTest.WebAii.BrowserSpecialized.Chrome.ChromeActions.LaunchNewCDPManagedBrowser(Manager manager, Boolean windowVisible)
   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)
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'2/28/2022 2:04:28 PM' - Test completed!