Repository for RHEL6/CentOS disappeared

[Stefano Cognigni]

Hi,
this morning i do not see more repositories for RHEL6 / Centos 6-7, only 
for openSUSE and SLES, if im'going to 
http://download.opensuse.org/repositories/security:/shibboleth/RHEL_6/, 
links of each package return 404 error, 
http://ftp5.gwdg.de/pub/opensuse/repositories/security:/shibboleth/RHEL_6/ 
directory don't exists, anyone know why?

Stefano C.