Trust CERN Root Certificate with Internet Explorer
By default, on managed Windows machines in the CERN domain, the certificates
of the CERN root and trusted certification authorities are trusted, so any
CERN certificate will be verified correctly.
On Windows machines outside the CERN domain (home PCs, external laptops, etc...) the
certificates of the CERN root and trusted certification authorities are not
trusted by default, so CERN Certificates will not be verified correctly.
On these machines, it will be necessary to install the CERN Root Certificates
to trust the CERN Certification Authority.
Resolution
The CERN Grid Certification Authority certificates are distributed through the
CERN Grid Certification Authority Files and Documents site.