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 got this domain name from the original web adapter config file. Our default web site adapter in IIS was called "arcgis" and the installer wouldn't let us name the new adapter "arcgis," because the folder was still in the webroot. 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.