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Which event log files does the IIS 7.0 Application Pool Recycling log to?
I want to check out at what time the default app pool automatically recylces.

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It is definitely System Log.

Which Log file? Well -- you can check the physical path by right clicking on the System Log (e.g. Server Manager | Diagnostics | Event Viewer | Windows Logs). The default physical path is %SystemRoot%\System32\Winevt\Logs\System.evtx.

You can create a Custom Filter and filter by "Source: WAS" to quickly see only entries generated by IIS.

You may need first to enable logging of such even for a specific App Pool -- by default App Pool has only 3 recycle events out of 8 enabled. To change it using GUI: II S Manager | Application Pools | Select App Pool -> Advanced Settings | Generate Recycle Event Log Entry.

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