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Fiddler crashes after just somke secondsa after it starts...

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Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at

VersionCheckFailed: Server Response Code = 502

Type: System.IO.InvalidDataException
Source: Fiddler
   at Fiddler.Updater.GetLatestVersion(Boolean includeBetaVersions, Boolean isEmergencyCall)

   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()

   at System.Threading.ThreadPoolWorkQueue.Dispatch()

Fiddler v4.6.2.3 (x64 AMD64) [.NET 4.0.30319.34209 on Microsoft Windows NT 6.1.7601 Service Pack 1]

  • Guest
  • Jun 15 2016
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  • janelle cox commented
    2 Nov, 2017 03:32pm

    Similar problem, I launch Fiddler, it just hangs never executes.   I have the latest version installed.

  • Guest commented
    23 Dec, 2016 05:27pm

    i have some problem... how to fix that ?



  • Deleted User commented
    20 Jun, 2016 01:25pm

    Please, download the latest version of Fiddler and try again. Let us know if the problem persists.

  • Eric Lawrence commented
    18 Jun, 2016 01:00am

    Possible workaround: Disable the version check using Tools > Fiddler Options > Check for Updates.


    This bug should be fixed soon, I hope.