正在尝试在RHEL 7,7上安装docker ce。-添加回购时无法访问网络？

我安装了RHEL 7.7的新安装。我正在尝试安装docker ce。当我尝试添加docker存储库时，我最终会收到一条网络无法访问的错误消息，但是我可以毫无问题地创建repo文件。我已启用HTTP_代理、HTTPS_代理和FTP_代理从该主机访问internet

知道为什么会这样吗

我的尝试：

me@prodbbivm01 ~ $ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: langpacks, product-id, subscription-manager
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
Could not fetch/save url https://download.docker.com/linux/centos/docker-ce.repo to file /etc/yum.repos.d/docker-ce.repo: [Errno 14] curl#7 - "Failed to connect to 2600:9000:2164:d200:3:db06:4200:93a1: Network is unreachable"


me@prodbbivm01 ~ $ wget https://download.docker.com/linux/centos/docker-ce.repo
--2020-03-04 10:03:18--  https://download.docker.com/linux/centos/docker-ce.repo
Resolving myproxy.com (myproxy.com)... 10.63.112.43
Connecting to myproxy.com (myproxy.com)|10.63.112.43|:3128... connected.
Proxy request sent, awaiting response... 200 OK
Length: 2424 (2.4K) [binary/octet-stream]
Saving to: ‘docker-ce.repo’

100%[=========================================================================================>] 2,424       --.-K/s   in 0s

2020-03-04 10:03:18 (324 MB/s) - ‘docker-ce.repo’ saved [2424/2424]

如果我尝试在未启用代理的情况下创建repo文件：

me@prodbbivm01 ~ $ wget https://download.docker.com/linux/centos/docker-ce.repo
--2020-03-04 10:05:04--  https://download.docker.com/linux/centos/docker-ce.repo
Resolving download.docker.com (download.docker.com)... 13.224.12.105, 13.224.12.14, 13.224.12.59, ...
Connecting to download.docker.com (download.docker.com)|13.224.12.105|:443... failed: Connection refused.
Connecting to download.docker.com (download.docker.com)|13.224.12.14|:443... failed: Connection refused.
Connecting to download.docker.com (download.docker.com)|13.224.12.59|:443... failed: Connection refused.
Connecting to download.docker.com (download.docker.com)|13.224.12.128|:443... failed: Connection refused.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:3c00:3:db06:4200:93a1|:443... failed: Network is unreachable.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:9e00:3:db06:4200:93a1|:443... failed: Network is unreachable.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:ce00:3:db06:4200:93a1|:443... failed: Network is unreachable.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:1000:3:db06:4200:93a1|:443... failed: Network is unreachable.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:1400:3:db06:4200:93a1|:443... failed: Network is unreachable.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:b200:3:db06:4200:93a1|:443... failed: Network is unreachable.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:5200:3:db06:4200:93a1|:443... failed: Network is unreachable.
Connecting to download.docker.com (download.docker.com)|2600:9000:2164:9000:3:db06:4200:93a1|:443... failed: Network is unreachable.

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嗯。。。我设法解决了这个问题，但我不明白它为什么起作用

我将http代理添加到yum.conf文件中，现在可以添加repo并从那里继续

对于yum来说，在环境中使用http代理还不够好吗