這是因為net core2.1默認使用的https，如果使用Kestrel web服務器的話沒有安裝證書就會報這個錯
其實仔細看他的錯誤提示，其中有一句叫你執行一個命令安裝證書的語句：
dotnet dev-certs https --trust
在cmd里邊運行下就會提示你安裝證書，安裝成功后就可以成功啟動了
免責聲明！
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