我目前正在尝试更新我的服务器。我使用的是Red Hat Enterprise Linux Server 6.2版（圣地亚哥）。
如果我输入任何命令，例如 yum update yum ，我会收到以下错误：
[root@u15457812000001 ~]# yum update yum
Loaded plugins: rhui-lb
Could not retrieve mirrorlist https://rhua-rcd-01.vic.svc.cloud.telstra.com/pulp/mirror//content/dist/rhel/rhui/server/6/6Server/x86_64/optional/os error was
14: Peer cert cannot be verified or peer cert invalid
Error: Cannot retrieve repository metadata (repomd.xml) for repository: rhui-rhel-6-server-rhui-optional-rpms. Please verify its path and try again
有人可以帮忙吗？