My company just upgraded from Server 10.3 to 10.5. We are trying to configure the web adapter and keep getting errors about invalid tokens after entering in our FQDN "http://METCONAPP.METCON.DOMAIN:6080 " We're using the user name and password from our previous 10.3 web adapter, which we uninstalled prior to installing 10.5. Our default web site adapter in IIS was called "arcgis" and the installer wouldn't let us name the new adapter "arcgis." We tried to delete this web adapter from the webroot folder and start over, but we still haven't made any progress. WE're not sure how to proceed. We need to get our website and ArcGIS server back online ASAP.