ArcPy - Create ArcGIS Server Connection File

CreateGisServerConnectionFiles.py

import arcpy

servers = ['myServer1', 'myServer2', 'myServer3']
outdir = 'GIS Servers' # using 'GIS Servers' results in creating the AGS files in the 'GIS Servers' section of ArcCatalog (equivalent to '%appdata%\ESRI\Desktop10.5\ArcCatalog')
username = ''
password = ''

for server in servers:    
    out_name = server + ' (admin).ags'    
    server_url = 'https://' + server + '/arcgis/admin'

    print "Creating '" + out_name + "'"
    
    arcpy.mapping.CreateGISServerConnectionFile("ADMINISTER_GIS_SERVICES",
                                                outdir,
                                                out_name,
                                                server_url,
                                                "ARCGIS_SERVER",
                                                username=username,
                                                password=password)