Connection refuse to local repo using yum update

[rpedruzzi]

Dear all,

I am trying to update my frontend following the Rocks website instructions (http://central-7-0-x86-64.rocksclusters.org/roll-documentation/base/7.0/update.html). However, after download the rpm and creating the .iso file, I can not update the system using the
yum update
Because I am getting an error with connection refused to the local repo.
Does anyone know how to fix it?

Regards
Here is the output of yum update command:

yum update
Loaded plugins: fastestmirror, langpacks
http://172.20.51.202/install/rocks-dist/x86_64/repodata/repomd.xml: [Errno 14] curl#7 - "Failed connect to 172.20.51.202:80; Connection refused"