Application Crashes With “Internal Error In The .NET Runtime”

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with exit code 80131506

That’s a nasty one, ExecutionEngineException. Starting with .NET 4.0, this exception immediately terminates the program. The generic cause is corruption of the state of the garbage collected heap. Which in turn is invariably caused by unmanaged code. The exact location in code at which this exception is raised isn’t helpful, the corruption usually occurred well before the damage is detected.

Finding the exact cause for this is going to be difficult. Review any unmanaged code your service might be using. Suspect environmental problems if there is no obvious candidate, misbehaving malware scanners are notorious. If it repeats very poorly then suspect hardware problems like soft RAM errors.

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