Available with Network Analyst license.
There are resources within the ArcGIS documentation to help you work with Network Analyst functionality in a server environment. Below is a list of links to relevant topics.
- Learn about the ArcGIS Network Analyst extension in ArcGIS for Server
- Get a general overview of network analysis services
- Work through a tutorial on publishing a network analysis service
- See examples of publishing geoprocessing services that use the ArcGIS Network Analyst extension
The documentation in the Prepare window warning messages section of the Network Analyst help describes solutions to errors and warnings that may appear when pulishing Network Analyst functionality to ArcGIS for Server.