New CentOS7 Install Yum will not work

Hi Everyone:

I have been fighting this all morning. I did a new (several) installs of
CentOS7. Yum will not update the system. I have disabled ipv6, set
yum.conf to use IPv4 only, disabled firewalld, disabled selinux, used both
static ip and dhcp for network connectivity. I can ping any where on the
Internet, including the mirrors, DNS works and ensured the base URL line
was uncommented. Any help would be appreciated.


This is the latest error I am seeing:
[root@localhost ~]# yum check-update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist
<a href=";arch=x86_64&amp;repo=os&amp;infra=stock" title=";arch=x86_64&amp;repo=os&amp;infra=stock">;arch=x86_64&amp;repo=os&amp;infra=stock</a>
error was
14: curl#7 - "Failed connect to; Operation now in
Could not retrieve mirrorlist
<a href=";arch=x86_64&amp;repo=extras&amp;infra=stock" title=";arch=x86_64&amp;repo=extras&amp;infra=stock">;arch=x86_64&amp;repo=extras&amp;infra=stock</a>
error was
14: curl#7 - "Failed connect to; Operation now in

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

2. Reconfigure the baseurl/etc. for the repository, to point to a
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.
will then just ignore the repository until you permanently enable it
again or use --enablerepo for temporary usage:

yum-config-manager --disable <repoid>
subscription-manager repos --disable=<repoid>

5. Configure the failing repository to be skipped, if it is
Note that yum will try to contact the repo. when it runs most
so will have to try and fail each time (and thus. yum will be be
slower). If it is a very temporary problem though, this is often a

yum-config-manager --save

Cannot find a valid baseurl for repo: extras/7/x86_64


Re: New CentOS7 Install Yum will not work

By Gordon Messmer at 12/05/2018 - 23:37

On 12/5/18 10:48 AM, Ed Morrison wrote:

What happens if you run "curl"?  I see this:

$ curl <a href="" title=""></a>
arch not specified

Test that, and then use curl on some other url.  "curl" maybe.

This should establish whether or not you have general network
connectivity.   Either way, you'll probably want to talk to your network
admins regarding the result.

Re: New CentOS7 Install Yum will not work

By Ed Morrison at 12/07/2018 - 11:38

Hi Gordon,

Thanks for the help and sorry for the delay in response.

Curl fails.  This so weird.   I dumped CentOS and installed Ubuntu,
Ubuntu is working fine.  I have other CentOS, Windows and Ubuntu Vms
working fine in the same environment.   I am using the same IP info for
Ubuntu that I was using for the CentOS VM.

I needed to get this server up and running, so I am going to keep Ubuntu
in place for now.  I will try a new CentOS vm as time permits.



On 12/5/2018 7:37 PM, Gordon Messmer wrote: