Mendix 11.12.0 debugging issue locally

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Hi Team,I am using Mendix studio pro 11.12.0 version.I am facing one issue after doing local run and also cannot able to debug locally but I can able to open application in localhost in browser.After doing local run, below error pop-up is comingSystem.Net.Http.HttpRequestException: Http Request failed with status 503 ServiceUnavailableat Mendix.Modeler.Debugger.Runtime.DebuggerClient.HandleRequestFailure(Exception requestException) in Mendix.Modeler.Debugger\Runtime\DebuggerClient.cs:line 198at Mendix.Modeler.Debugger.Runtime.DebuggerClient.DoHttpRequestAsync(DebuggerRequest debugRequest, CancellationToken cancellationToken, Int32 timeout) in Mendix.Modeler.Debugger\Runtime\DebuggerClient.cs:line 186at Mendix.Modeler.Debugger.Runtime.DebuggerClient.PerformRequest(DebuggerRequest request, Int32 timeout) in Mendix.Modeler.Debugger\Runtime\DebuggerClient.cs:line 168at Mendix.Modeler.Debugger.Runtime.Messages.DebuggerRequest.Execute(Int32 timeout) in Mendix.Modeler.Debugger\Runtime\Messages\DebuggerRequest.cs:line 57at Mendix.Modeler.Debugger.Runtime.DebuggerClient.StartSession(IEnumerable`1 breakpoints) in Mendix.Modeler.Debugger\Runtime\DebuggerClient.cs:line 63at Mendix.Modeler.Debugger.Runtime.DebuggerController.StartDebugging(String url, SecureString password, ConnectionMode mode, IEnumerable`1 breakpoints) in Mendix.Modeler.Debugger\Runtime\DebuggerController.cs:line 93at Mendix.Modeler.Debugger.View.DebuggerUI.<>c__DisplayClass67_0.<StartDebugging>b__1() in Mendix.Modeler.Debugger\View\DebuggerUI.cs:line 324at Mendix.Modeler.Utility.BackgroundUtil.<>c__DisplayClass1_0`1.<Do>b__0(Object s, DoWorkEventArgs e) in Mendix.Modeler.Utility\BackgroundUtil.cs:line 36at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)I have attached screenshot also.Can anyone help me on this?Note : I have attached deployment section details.
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1 answers
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Hi Sweety,

Since the application is opening successfully on localhost, but the Debugger is returning 503 ServiceUnavailable, it looks more like an issue with the local debugger/runtime connection rather than the application itself.


I noticed you mentioned that the same application works correctly with Mendix 10.24.13. Since you're now using 11.12.0, I would first try updating Studio Pro to the latest 11.12.x patch. Mendix has released fixes in the 11.12.x patches, so testing on the latest patch would be a good first step.


You can also try:

  • Stop the local application completely and run it again.
  • Check the Console immediately after starting the application for any Runtime errors.
  • Try Run Locally first and confirm the application is fully started before selecting Run → Debug.
  • Check whether another application/process is using any of the required local ports.


Kindly mark this as the accepted answer if it helps.

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