Cannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again

Loaded plugins: fastestmirror One of the configured repositories failed (Unknown), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this:     1. Contact the upstream for the repository and get them to fix the problem.     2. Reconfigure the baseurl/etc. for the repository, to point to a working        upstream. This is most often useful if you are using a newer        distribution release than is supported by the repository (and the        packages for the previous distribution release still work).     3. Run the command with the repository temporarily disabled            yum --disablerepo=
    
      ...     4. Disable the repository permanently, so yum won't use it by default. Yum        will then just ignore the repository until you permanently enable it        again or use --enablerepo for temporary usage:            yum-config-manager --disable 
     
              or            subscription-manager repos --disable=
      
            5. Configure the failing repository to be skipped, if it is unavailable.        Note that yum will try to contact the repo. when it runs most commands,        so will have to try and fail each time (and thus. yum will be be much        slower). If it is a very temporary problem though, this is often a nice        compromise:            yum-config-manager --save --setopt=
       
        .skip_if_unavailable=trueCannot retrieve metalink for repository: epel/x86_64. Please verify its path and try again
       
      
     
    

  今天在使用yum安装软件时遇到了如上报错，提示信息发现提示我epel源有问题，但是经过和可以安装的主机epel源的对比，发现并没有差别，所以问题肯定不在epel源配置文件上，所以就需要分析环境上的差异了，这台云主机是一台纯内网服务器，使用yum安装是通过使用了公网云主机的tinyproxy代理，而且使用curl命令测试连接网站没问题，也就是当前代理还在生效中，epel源就是使用yum命令安装的，所以yum也没问题，解决办法以及配置写到下面：

vim /etc/profile

export http_proxy=http://192.168.1.1:2525export https_proxy=https://192.168.1.1:2525

  报错的原因是我在使用tinyproxy代理时，本地配置http全局代理，但是没添加https协议的代理，所以出现了以上的报错，添加https协议代理后，yum可以正常安装。