Troubleshooting HTTP 502.5 startup issues in Azure AppService for ASP.NET Core Websites




First published on MSDN on Jun 10, 2018




Whenever ASP.NET Core website fails to start in Azure AppService we get HTTP


502.5 error and this below error page


















To troubleshoot this startup error, we need to capture addition logs.


Here are the steps to capture logs :









  1. Go to SCM site, just add

    .scm

    before

    .azurewebsites.net

    in


    the URL as shown below



















  2. In the SCM website, click on the

    Debug Console

    |

    CMD







  3. Click on

    Site

    |

    WwwRoot

    folder






  4. Look for

    web.config

    file, now click on the pencil icon to edit it






  5. Change the web.config as highlighted below





































    <aspNetCore


    processPath=”dotnet”


    arguments=”.\webapp.dll”


    stdoutLogEnabled=”true”


    stdoutLogFile=”\\?\%home%\LogFiles\stdout”>




    </aspNetCore>











  6. Now, try to browse to the home page of your website






  7. You should see same startup failure error message






  8. Go back to SCM website






  9. Navigate to d:\home\Logfiles






  10. You should now see stdout_xxx_datetime.log as shown below

















  11. Click on the pencil icon to view it.






  12. You should see the callstack and line # of the exception


    as shown below


















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