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IIS URL Rewrite 2.1 is not officially available for ARM64 processors.
Is IIS URL Rewrite 2.1 available for ARM64 processors?
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Keith MacDonald
0
Reputation points
The x64 build of IIS URL Rewrite 2.1 does not work on a Surface 7 laptop with an ARM64 processor. When will a native ARM64 build be released?
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XuDong Peng-MSFT 10,841 Reputation points Microsoft Vendor2024-12-11T03:23:38.1833333+00:00 Hi @Keith MacDonald,
The x64 build of IIS URL Rewrite 2.1 does not work on a Surface 7 laptop with an ARM64 processor.
Does it still not work using x86/x64 application pool (instead of ARM64 application pool)?
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Keith MacDonald 0 Reputation points
2024-12-11T07:42:26.78+00:00 There do not seem to be processor specific application pools available, other than 32-bit. The options when adding an application pool are between .NET CLR and no managed code, with pipeline options Integrated or Classic. When setting application pool defaults, there is an option to enable emulation on ARM64 which is set to TRUE, and another option to enable 32-bit applications which is set to FALSE. What have I missed?
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XuDong Peng-MSFT 10,841 Reputation points Microsoft Vendor
2024-12-11T09:37:05.1366667+00:00 Hi @Keith MacDonald,
there is an option to enable emulation on ARM64 which is set to TRUE
Yes, try setting the option to value "false" and check if it works for you.
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Keith MacDonald 0 Reputation points
2024-12-11T11:55:35.5533333+00:00 Thanks for the suggestion, but doing that resulted in these errors:
"Application pool 'DefaultAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool."
"The Module DLL 'C:\Windows\system32\inetsrv\rewrite.dll' could not be loaded due to a configuration problem. The current configuration only supports loading images built for a ARM64 processor architecture."
If I reset the enable emulation option to TRUE, I don't get those errors, but then rewriting does not happen.
Is there more to making that module available for ARM64 than recompiling it?
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XuDong Peng-MSFT 10,841 Reputation points Microsoft Vendor
2024-12-13T01:52:59.81+00:00 Hi @Keith MacDonald,
Is there more to making that module available for ARM64 than recompiling it?
Unfortunately, I don't have enough environment to test it, maybe you can try @Lex Li's suggestion as mentioned below.
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S.Sengupta 21,061 Reputation points MVP2024-12-11T02:47:36.63+00:00 -
Keith MacDonald 0 Reputation points
2024-12-11T07:33:46.3433333+00:00 I am aware of that, but I was hoping to find out when, if ever, it will be officially available.
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Lex Li (Microsoft) 5,742 Reputation points Microsoft Employee2024-12-11T20:00:02.9766667+00:00 Since Microsoft ships an ARM64 compatible rewrite.dll with IIS Express (as part of VS 2022 for Windows ARM64), it is possible to copy the binaries of rewrite.dll on the same machine to enable full IIS support for x86/x64/ARM64 web apps.
If you want to stay with the default configuration, install Microsoft's URL Rewrite module and then use x86 or x64 application pools on your machine to host web apps.
If you want to stay on the edge, you might install IIS Express from Arm64 Visual Studio, and then use my PowerShell script to copy the ARM64 compatible URL Rewrite module from IIS Express to IIS, https://github.com/lextm/rewrite-arm64.
You'd better read my post here to learn more about Windows ARM64 if you want to use IIS/ASP.NET properly.