Hi Mark,

Start with Basic Troubleshooting to find out the error.

Hope it helps,

Joe

That means the error is probably related to Web.config, it cannot load Web.config therefore it can't use the settings to show the error detail. You will have to find out the error from your host. Typically this happens when the framework version is not correct like if using the 3.5 mojo files under .NET 4 or using the 4.0 mojo files under .NET 3.5, but it can also be cause by something as simple as a typo in your Web.config file. In any case the error should be logged on the server in the application log so the host should be able to find out the error detail.

Hope it helps,

Joe

Sorry Mark,

I tried to help but we need more help from rackspace, it is not sufficient to say its a web.config error and point to the doc about breaking changes in .NET 4, I already know about those breaking changes and our Web.config file is correct for .NET 4.

We need rackspace to provide the error details to get further, just saying its a web.config error is not sufficient, we need the exact error. I would restore the original Web.config file (not the one I sent you but the one you sent me) then pressure rackspace for more details.

Best,

Joe