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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
в Fiddler.Updater.GetLatestVersion(Boolean includeBetaVersions, Boolean isEmergencyCall)

в Fiddler.Updater.EmergencyUpdateCheck(Object stateInfo)

в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

в System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack)

в System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)

Fiddler v2.6.2.3 (x64 AMD64) [.NET 2.0.50727.5485 on Microsoft Windows NT 6.1.7601 Service Pack 1]

  • Guest
  • May 5 2016
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  • Guest commented
    23 Dec, 2016 05:26pm

    how to fix it ?


    Best regards,

    Ficri Pebriyana

  • Guest commented
    1 Nov, 2016 02:22am

    I found fiddler shows some wrong data when the data is big, such as the right data 16103117253139125, fiddler shows as 16103117253139124, the right 16103117253134553, the wrong 16103117253134552. other tool,such as Postman can show the right data.

  • Eric Lawrence commented
    10 Jul, 2016 05:47pm

    This bug should be fixed in the latest version.

  • Guest commented
    5 May, 2016 10:23am

    FIdler working until press ok on error window

    then it block enternet as blocked proxy, so it must keep error window and exit from main exit button