The "services" NIS map will not download and the following error message is seen in the debug output from the "vasypd -d -g6 -x" command:
handle_generic_filtered_map_updates: skipping services because standard...
The problem in this instance was caused by an incomplete "services" map. When aliases are used the displayName attribute is used to store the original name for the entry. This attribute was missing causing vasypd to fail to load the map.