Running ASP.NET on Windows Server 2003 64 bit edition
Running version 2.0 of the .NET Framework does not seem to be too complicated. Note however
that there is a separate version of the Framework for 32 bit and 64 bit versions. Another thing
of importance is that IIS will only run in either 32 bit mode or 64 bit mode, not both at the
same time. Microsoft has an article detailing how to switch the mode IIS uses
of the Framework, on the other hand, can be a bit confusing. Unlike version 2.0 of the Framework
there is not a separate version
for version 1.1, both 32 bit and 64 bit versions use the same setup file. Another restriction
of version 1.1 is that IIS must be set to operate in 32 bit mode, so if any other websites
using version 2.0 of the framework are running on the server, they must be compiled to work in 32 bit.
I had problems installing the Framework from the setup file. I received an error about not having
sufficient disk space. More about this and a solution can be found
Why is the ASP.NET tab missing from the property pages of website in IIS? Good question,
ask Microsoft. This seems to be a bug in the 64 bit version of Windows. When versions 1.1 and 2.0 of
the Framework are installed, the ASP.NET tab which would normally be visible and allow you to
switch the version the application will run under, is missing. There are a few workarounds. The
first is a manual fix for the websites that need to be switched. Under the application configuration
settings, on the mappings tab, change each extension to point to the correct aspnet_isapi.dll
location. There is an aspnet_isapi.dll for each version of the .NET Framework installed, by default,
in the "WINDOWS\Microsoft.NET\Framework" folder. If the current version is 1.1 and you want it to run under 2.0
you would change the location of the aspnet_isapi.dll from "WINDOWS\Microsoft.NET\Framework\v1.1.4322\aspnet_isapi.dll" to
Another option is to run the aspnet_regiis.exe file with the appropriate switches to configure
the correct website and/or virtual directories. I have not undertaken this approach, but it is possible.
This brings me to the last method which I will list.
A handy program to change the ASP.NET version used by IIS can be gotten from
Denis Bauer. It can be downloaded from his site
He basically runs the aspnet_regiis.exe inside of his application to do the configuration. More
info can be found on his site.