.net core 在iis部署遇到502错误：

HTTP Error 502.5 - Process Failure

Common causes of this issue:

• The application process failed to start
• The application process started but then stopped
• The application process started but failed to listen on the configured port

Troubleshooting steps:

• Check the system event log for error messages
• Enable logging the application process' stdout messages
• Attach a debugger to the application process and inspect

解决方案： 

1、选中应用程序池-->高级设置-->加载用户配置文件设为true.

2、在Web.config中找到<aspNetCore processPath="dotnet" arguments=".\OpenAuth.WebApi.dll" stdoutLogEnabled="true" stdoutLogFile=".\logs\stdout" />

把stdoutLogEnabled设置为true，在stdoutLogFile配置的文件夹logs下找到log文件，点开查看具体错误。我的是少了log4net.config配置文件，发布的时候没有生成，从源代码中拷贝过去就可以了