Thursday, May 17, 2018

HTTP 502.5 When Deploying ASP.NET Core Site to AWS EBS

I recently had a fun time diagnosing a weird deployment error in the following environment:

  • ASP.NET Core 2.0 site hosted on AWS EBS
  • VS 2017
  • IIS 10.0 running on 64-bit Windows Server 2016/1.2.0
After deployment, the site fails to load with a "HTTP Error 502.5 - Process Failure.  When retrieving logs from EBS, we see an error when starting the site:

Error 0:(0) IIS AspNetCore Module - Application 'MACHINE/WEBROOT/APPHOST/DEFAULT WEB SITE' with physical root 'C:\inetpub\AspNetCoreWebApps\app\' failed to start process with commandline 'dotnet .\MYAPP.dll', ErrorCode = '0x80004005 : 8000808c.

In the end, the fix was simple:  Downgrade the "Microsoft.AspNetCore.All" nuget package to the last version.

I believe what is happening here is AWS doesn't have the newest version of the .NET Core runtime and is failing because of it.  I believe you could also fix this by installing the correct version of the runtime on the EBS instance or specifying a runtime in the csproj.

In the past, a new deployment into a fresh EBS application has also fixed the issue, but did not in this instance.

Addendum: If you are having this issue on your local box, install the version of the SDK that the project requires.  You may need to install the 1.0 or 1.1 SDK for example.

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