What do agencies need to do to validate the GSA MSO Shared Service Provider (SSP) issued certificates?

Answer: 

The GSA MSO Shared Service Provider, Entrust Managed Services (EMS) Shared Service Provider (SSP) publishes certificate status in Certificate Revocation Lists (CRLs) accessible via LDAP and HTTP. In addition, EMS SSP supports validation of PKI certificates via Online Certificate Status Protocol (OCSP). The information for validation of a PKI certificate is contained within each certificate.

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