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topic=/help.domino.admin.doc/DOC/H_KEY_USAGE_EXTENSIONS_FOR_INTERNET_CERTIFICATES_1521_OVER.html): In addition to validating the identity of the certificate holder an application may validate the purpose that the certificate is authorized for to ensure it is valid for its current use.This validation is what prevents any non-CA certificate from acting as a certification authority and issuing certificates.

By default, an Active Directory Certificate Services (ADCS) enterprise CA will publish its certificate to the Active Directory configuration partition which is automatically replicated to all domain controllers in the forest.This provides site awareness and resiliency, however this path is best suited for internal use only since its path is likely inaccessible to external clients and can reveal information about your forest.As a side benefit, certificates published to clients provide additional configuration options to include configuration of cross-signing certificates, OCSP server address, extended validation options, and purpose limitation through the certificates snap-in or through Group Policy.Since root CAs do not have an issuer their certificate will not have all of the information available used to validate other types of certificates (i.e. Because of this, to establish trust with a root CA it must be installed in the trusted root certification authorities container (Root CA).As discussed in my post on the X.509 certificate, any version 3 certificate signed by a certification authority should have at least one entry under the "Authority Information Access" pointing clients towards a location where they can obtain the certificate of the signing CA to validate the relationship.

This path should be available to all clients that may need to validate certificates issued by or chaining to the CA.The alternative is to present the AIA path using HTTP, a more common and Internet-friendly means of distribution.When using HTTP ensure that the web servers publishing the AIA path are highly available and scalable to handle requests from every client that may need to validate a certificate issued by the CA.Once a certificate is issued the AIA path cannot be changed without reissue, therefore the location used to publish these certificates must be thoroughly thought out.The AIA field allows for either HTTP or LDAP paths to provide flexibility in publishing locations.Some important considerations when deciding on the number and location of AIA paths include: To reduce the number of connections to an AIA publishing point and increase resiliency of certificate validation it is sometimes ideal to install CA certificates to the Intermediate Certification Authorities (Sub CA) store of validating clients.