https://arcgis.vgsi.com/server/rest/services/Somerville_MA
https://arcgis.vgsi.com/server/rest/services/Somerville_MAThis is a folder inside the services directory, not the server root. Trim back to /rest/services to connect to the whole server.
This is a folder inside the services directory, not the server root. Trim back to /rest/services to connect to the whole server.