Some times it happens. You were trying to install something and Yum gets stuck. No error messages, it’s just stuck. After you do several Ctrl+C, you’re back in the shell. But, yum is still not working as it should. There could be several reasons why it happens, and the fixes are pretty simple.

Applicable to : Centos 6/7, Fedora

• Check if you have the DNS set properly in your server. You can try something like
ping www.google.com
If you are getting a response, your DNS is working fine. If not, check the /etc/resolv.conf file Add the following in it ( if not already exists )

Now try again. If it still does not work, check step 2

• Clean and rebuild the RPM databases

It should work now. If you’re still facing issues, it’s probably the firewall. Check your firewall rules and make sure that the server can contact the remote repositories.