%1 is not a valid Win32 application

Question

User1787206575 posted

I have the 64 bit Win2k8 server and on that hosted a web app. The web app is running successfully on 32 bit but on 64 bit OS it throw an error of "HTTP - 500 Internal Server Error".

After debug the IIS is got the error %1 is not a valid Win32 application.

I have already enabled the 32 bit mode.

Can any help?

 Thanks Kapil

Answer 1

User844605415 posted

Are you trying to run the worker process as Wow64(32-bit)?

In that case there is a good chance that your configuration is trying to load some 64-bit isapi filter, for example aspnet_filter.dll,for v2.0, on a 64-bit OS there will be two instances of this dll on your machine under \framework and \framework64 folders. You want to select the one under \framework.

Thanks,
Mukhtar Desai
IIS Performance Team

Answer 2

User1787206575 posted

Apply your solution it still doesn't work. Same error is coming. After enbling feb see the error trace.

MODULE_SET_RESPONSE_ERROR_STATUS Warning<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

ModuleName="IsapiModule", Notification="EXECUTE_REQUEST_HANDLER", HttpStatus="500", HttpReason="Internal Server Error", HttpSubStatus="0", ErrorCode="%1 is not a valid Win32 application.<o:p></o:p> (0x800700c1)", ConfigExceptionInfo=""<o:p></o:p>

<o:p> </o:p>

I have alo created a simple webapp which haeve only one html(static) page, and on browsing it, it will give me the error of 500 Intenal server error. Its only happen on 64 bit machine.

 

Can anyone help me out?

 

Thanks

Kapil

Answer 3

User914878585 posted

 In you application pool, there is a property to enable 32 bit applications

Answer 4

User-154240766 posted

tks <3