You're right http://____:6080/arcgis/rest/services/_____/______/MapServer/0?f=json&callback=dojo.io.script.jsonp_... Failed to load resource: net::ERR_BLOCKED_BY_CLIENT
Maybe you know what must be enabled on AGS?
I don't recall the last time I used "localhost" in a url. I always use the machine name like "gislap183". Can you try using your machine name instead?
If you are using a windows machine then go to the start button and right click on "computer" and choose properties. Find Computer name: blah. then use this name in the url instead of "localhost"
I suspect that something is wrong I did to IIS. When I instead localhost / AppName writing PKName / AppName, I get the following:
HTTP Error 404. The requested resource is not found.
Please advise where to start to find out that I was able to give through Intrent other users access to the application configured with WAB.
You can read thru the help docs About ArcGIS tokens—Documentation (10.3 and 10.3.1) | ArcGIS for Server
For a list of many Geonet links, you can look thru the blog Summary of ArcGIS Server SSL Issues
You may need to use a proxy if with the token to access your services, even if not secure.