Reading of machine.config on every request

ISAPI_Rewrite is Apache mod_rewrite compatible URL rewriter for Microsoft IIS
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Joined: 11 Nov 2016, 20:29

Reading of machine.config on every request

02 Jan 2017, 17:23

We've noticed with process monitor that Isapi_rewrite.dll (version 3, 1, 0, 82) is reading machine.config completely on every request - see attached image for screen shots. Those read impacts scalability and performance on high volume load test.

Is this a known defect, can it be eliminated?

isapi_rewrite_machine.config.png (126.64 KiB) Viewed 3673 times

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Posts: 402
Joined: 06 Mar 2012, 11:59

Re: Reading of machine.config on every request

02 Feb 2017, 11:57


Sorry for the delay.

This is strange, however, I cannot confirm this behavior locally. I tried with ISAPI_Rewrite build 112 64-bit version on Windows 10. Please try to upgrade to the most current version of ISAPI_Rewrite first.
What makes it even more strange is that ISAPI_Rewrite is a legacy ISAPI filter and actually knows nothing about .NET, IIS Pipeline and machine.config files, hence is unlikely to ever request one.

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Joined: 01 Dec 2012, 14:22

Re: Reading of machine.config on every request

21 Feb 2017, 11:18

Am I missing something here? From that trace, it would appear to be w3wp.exe that's reading the file. That's the application pool manager, surely?

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