3.1.3 Configuration Updates Synchronization
If this is an initial synchronization, the DSS obtains and persists the full set of categories, update classifications, and detectoids that are available on the USS. On subsequent synchronizations, the DSS obtains and persists the categories, update classifications and detectoids that have been added to the USS since the last successful synchronization. The DSS obtains the list of such updates by using a single GetRevisionIdList request, as specified in [MS-WSUSSS] section 126.96.36.199. Note that on subsequent synchronizations, the DSS has to include the anchor it received from the USS as part of the previous synchronization in the GetRevisionIdList request. The update metadata is then obtained through a series of batched GetUpdateData and GetUpdateDecryptionData requests, as specified in [MS-WSUSSS] section 188.8.131.52.