I am able to get WAB Dev to launch in my browser when using localhost:3344/webappbuilder, but not when I try to use machinename.domain:3344/webappbuilder. This is a problem because when I use localhost I cannot connect to my org's AGOL URL (Unable to access, a server with the specified hostname could not be found error). I am led to believe this is because of CORS settings in the admin settings - my app connection has been approved and my machine name added to the list of Allow origins, but localhost has not.
When I try to launch using my machine name I just get a "This site can't be reached" with DNS_PROBE_FINISHED_NXDOMAIN error.