Hello,

I was trying to install Centos Stream 10 from the current BOOT iso image downloaded from  
https://mirror.stream.centos.org/10-stream/BaseOS/x86_64/iso/CentOS-Stream-10-20240904.1-x86_64-boot.iso

At some point the installation got to "Installation summary" where there was error "Error setting up base repository" for the "Installation Source".

I was behind the firewall, it was needed to set the proxy, but even after setting the correct proxy the list of mirrors didn't reload and was empty.

After entering "http://mirror.stream.centos.org/10-stream/BaseOS/x86_64/os" it was possible to continue with the installation.

This apparently already happened with Centos 8:
https://www.networkshinobi.com/centos-8-error-setting-up-base-repository/
https://forketyfork.medium.com/centos-8-installation-error-setting-up-base-repository-4a64e7eb2e72