这是因为net core2.1默认使用的https，如果使用Kestrel web服务器的话没有安装证书就会报这个错
其实仔细看他的错误提示，其中有一句叫你执行一个命令安装证书的语句：
dotnet dev-certs https --trust
在cmd里边运行下就会提示你安装证书，安装成功后就可以成功启动了
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