see explanation below.
Explanation
vim/etc/yum.repos/base.repo
[base]
name=base
baseurl
http://server.domain11.example.com/pub/x86_64/Server
gpgcheck=0
enable=1
Save and Exit
Use yum list for validation, the configuration is correct if list the package information. If the Yum configuration is not correct then maybe cannot answer the following questions.