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ASP.NET Core 2.0 Upgrade causes HTTP 502

ASP.NET Core 2.0 Upgrade causes HTTP 502

ASP.NET Core 2.0 Upgrade causes HTTP 502

A lot of guys run into an error during the upgrade fom ASP.NET Core 1.x to ASP.NET Core 2.0:

HTTP Error 502.5 - Process Failure

The reason is very simple:

ASP.NET Core 2.0 merges all assemblies into one to improve the startup time. Side effect: your deployment packages has less files.

This also means: you have to configure your deployment and delete all additional files in your deployment target!

For example: by default this is not activated in the Visual Studio Team Services deployment tasks to Azure.

2017 09 10 Azure CD   Visual Studio Team Services

You have to activate this checkbox or configure your deployment to remove all additional / old files.