nss-softokn breaks yum and rpm

Hello.

after updating with yum (yum update nss-softokn) i can't install nothing in my server (Rhel linux 6.6).
if I run "yum list updates" i get the error:
Complementos cargados:product-id, refresh-packagekit, rhnplugin, security, subscription-manager
This system is receiving updates from RHN Classic or RHN Satellite.
https://cdn.redhat.com/content/dist/rhel/server/6/6Server/x86_64/cf-tools/1/os/repodata/repomd.xml: [Errno 14] PYCURL ERROR 77 - "Problem with the SSL CA cert (path? access rights?)"
Intentando con otro espejo.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: rhel-6-server-cf-tools-1-rpms. Please verify its path and try again

what can i do to solve this. Can't use yum or rpm

best regards