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Asked: 2026-06-04T01:03:22+00:00

I am using IIS 7.5 on a Windows Server 2008 R2 machine to connect

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I am using IIS 7.5 on a Windows Server 2008 R2 machine to connect to a MySQL server through ODBC driver 3.51.

When I developed the application in VS 2010, I created a 64 DSN (using c:\windows\sysWOW64\odbcad32.exe) for the connection and everything was going great.

However when I have deployed the application on IIS, it is not using this DSN. So I created a 32 bit DSN.

Now I am facing the problem of Arithmetic operation resulted in an overflow on every other page.

Please help. How can make IIS use 64 bit DSN that I created while developing the application?

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1 Answer

  1. Editorial Team

    Check the Enable 32 Bit Applications setting of your websites Application Pool to switch between running your website in 32 or 64 Bit mode.

    See How to Enable a 32-bit Application Pool in IIS 7 for details.

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