The Get Travel Modes function fails at REST with the error: "'Default Travel Modes File' does not exist or is not supported" after following the documentation to publish Street Map Premium for ArcGIS (North America TomTom 2015 Release 3) data to ArcGIS 10.4.1 for Server.
This has been fixed per https://github.com/Esri/network-analysis-services/issues/7
解决办法
Copy the file from <DRIVE>:\arcgisserver\directories\arcgissystem\arcgisinput\Routing\NetworkAnalysisUtilities.GPServer\extracted\cd\ndsupportingfiles to <DRIVE>:\arcgis\ServiceDefinition\0\cd\ndsupportingfiles and refresh the REST endpoint of the Get Travel Modes's Execute Task to see that it runs successfully.