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I have developed an ASP.NET web application consisting only of generic http handlers. I started on a x86 development machine tested locally using IISExpress, then deployed on a 32bit Windows 2003 Server with IIS6.0, and everything went well.

My company decided to update to an x64 environment in order to take advantage of some third party libraries that are optimized for 64bit environments, hence we switched to a 64bit Windows Server 2012 R2 std edition, but I'm having some troubles.

On my local machine, now switched to a x64 dev machine with platform target set to x64 everything goes well, but when deploying on the server I always get

System.BadImageFormatException

on the main assembly. Other part of the error message says that the assembly manager is loaded by

C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll

and it is executed with

C:\Windows\SysWOW64\inetsrv\w3wp.exe

Since SysWOW64 it is needed to run 32bit applications inside 64bit environments, it is possible that IIS server on the production machine is not enabled to run x64 web applications? If so what should I do to overcome this issue, knowing that I do not have direct access to the server.

Thank you.

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  • what do you have the properties setup as at the project ->properties...? tell us what the PlatForm Taraget is this sounds like this is where the issue lies Commented Feb 2, 2015 at 22:00
  • Platform Target is set to x64 Commented Feb 2, 2015 at 22:01
  • well either set it to Any or x86 can you try that and report back on if making the changes fix the issue Commented Feb 2, 2015 at 22:05
  • yes sure. but in the end I will need to compile with Platform Target set to x64 because of the third party library and the fact that we need to use Oracle.Data.Access that is suggested to be compiled for the specific platform. Commented Feb 2, 2015 at 22:08
  • 1
    actually I disagree especially in regards to Oracle.. I had this issue last week and I had to download the 32bit version for Oracle and the 64bit version for .net in regards to Oracle has a serious BUG ... Commented Feb 2, 2015 at 22:10

1 Answer 1

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The error and the paths:

C:\Windows\SysWOW64\inetsrv\w3wp.exe

and

C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll

...definitely prove that the production server you're deploying to is running its website application pools in 32 bit mode, or certainly yours anyway.

As a web hoster we do the same for a bunch of legacy reasons. Have a word and see if they'll flip it back to native 64 bit mode.

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1 Comment

This was the problem, 32bit mode was enabled for the application pool.

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