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I'm reviewing the system log of a Windows Server 2008 R2 machine used as an Azure web role instance and I see the following messages from Service Control Manager:

2:28:28 PM The Microsoft .NET Framework NGEN v4.0.30319_X86 service entered the running state.
2:28:28 PM The Microsoft .NET Framework NGEN v4.0.30319_X86 service entered the stopped state.
2:28:28 PM The Portable Device Enumerator Service service entered the stopped state.
2:28:29 PM The Microsoft .NET Framework NGEN v4.0.30319_X64 service entered the running state.
2:28:29 PM The Microsoft .NET Framework NGEN v4.0.30319_X64 service entered the stopped state.

This looks suspicious - why would NGEN service start and then immediately stop?

What's going on? Is this normal behavior?

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