我正在尝试按照“.NET Tutorial - Hello World in 5 minutes“中的说明在Centos 7上安装.net Core SDK 2. 0. 0。
当我运行第一个命令时

sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc

我得到这个错误：

curl: (60) Peer's Certificate issuer is not recognized.
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.
error: https://packages.microsoft.com/keys/microsoft.asc: import read failed(2)

我在一个公司代理后面，似乎这个错误与SSL证书和curl有关，但我不知道如何修复它。
此外，当我使用curl或wget下载HTTPS URL时，也会出现类似的错误。