So I'm on a server with no internet access (trying to debug an intranet application).
In Fiddler Options, OI have "Check for updates on startup" cleared, and "Offer upgrade to beta versions" cleared as well. Seconds after starting it, I get an exception:
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Awww, Fiddlesticks!
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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 http://www.telerik.com/forums/fiddler.
VersionCheckFailed: Server Response Code = 0
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 6.2.9200.0]
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OK
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Shouldn't it, y'know, not be checking for updates when I explicitly told it not to? Application dies, game over...