ASP.Net - Service Unavailable

So im migrating my website to a new web server (win 2003 64bit) Setup the website set the framework to 4.0, browse the site and get "Service Unavailable" mmm, useful. I notice that that the AppPool Crashes, The event log reports "A process serving application pool 'DefaultAppPool' reported a failure. The process id was '193312'. The data field contains the error number."

Also I did have to follow this guide as my Asp.net wa开发者_Python百科s missing 2E002E002E00.aspx">http://weblogs.asp.net/plip/archive/2006/05/25/Where_2700_s-the-ASP.NET-Tab-in-IIS_3F00_-It_2700_s-Missing_2100_-I_2700_ve-installed-.NET-2.0-2E002E002E00.aspx

Any Ideas what I need to do to fix this?

Thanks

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It looks like your default app pool was set to .net 2.0. Unlike 3.0 and 3.5, the 4.0 framework does not run on the 2.0 base. You will need to set up the apppool to use .net 4. If you are using IIS 7 you will be able to have 2 app pools using different frameworks. However IIS 6 can only run 1 framework at a time. So if you are running IIS 6 you will need to choose 2.0 or 4.0.

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Ensure that the application pool is set to 'Allow 32bit applications'=true.

you can check this by right clicking the application pool and choosing 'advanced settings'

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Solution was to uninstall IIS and framework, reinstall .net framework (64bit) by using aspnet_regiis -i