Having security certificate issues on DLA applications?

While most computers automatically recognize public Certification Authorities (CAs) that are trusted to validate the identity of the secure (HTTPS) websites, many .MIL sites are verified through private DoD CAs whose certificates require manual installation by a local system administrator. IT departments within the DoD typically install and update these certificates for their employees automatically, but there are occasions that updates do not reach all user workstations and a manual installation becomes necessary.  Non-DoD agencies, private sector organizations and home users do not typically have DoD CA certificates installed on their computers and will more than likely be required to complete the steps on the Defense Acquisition University (DAU) guide  in order to access many DLA resources.