ArcGIS Server provides web access to its map service contents. To access the content, you need to know the ArcGIS Server name and the site name. By default, ArcGIS Server is reached through port 6080. It can also be reached through port 80 if it has been configured and licensed to deliver web content. REST Service endpoints can be reached through your browser with this address:

http://<GIS Server Name>:6080/<site name>/rest/services

Where GIS Server Name refers to the ArcGIS Server machine, and site name refers to the ArcGIS Server instance which, by default, is arcgis, the port number is optional if ArcGIS Server has been set up to deliver traffic on port 80. This is the default port for Internet traffic.

When there are multiple GIS Servers, often handling a large load of traffic or complicated services, a web adaptor may be installed. The web adaptor routes traffic to multiple ArcGIS Servers, based on service requests, load balancing, and other related...