error during installation - centos 7

[IGNRexI]

Cannot open: ztncui-release-1-1.noarch.rpm. Skipping. [root@myserver ~]# sudo yum install ztncui -y Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile epel/x86_64/metalink | 32 kB 00:00 Could not retrieve mirrorlist https://download.key-networks.com/el7/ztncui/1/mirrorlist error was 14: curl#7 - "Failed connect to download.key-networks.com:443; No route to host"

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=<repoid> ...

 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 <repoid>
    or
        subscription-manager repos --disable=<repoid>

 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=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: ztncui [root@myserver ~]#

[Fastidious]

If you got root, you do not need sudo, though it will still work.

As per documentation, simply use:

sudo yum install https://download.key-networks.com/el7/ztncui/1/ztncui-release-1-1.noarch.rpm -y

It just works.

[key-networks]

@IGNRexI have you tried Fastidious's suggestion?

[Nifty-07]

Used: yum install https://download.key-networks.com/el7/ztncui/1/ztncui-release-1-1.noarch.rpm -y Then tried to install ztncui-release (yum -y install ztncui-release) and got the below error:

• Installed package ztncui-release-1-1.noarch (from /ztncui-release-1-1.noarch) not available.