Very new to this Web AppBuilder and operating it. LEarning as I go. Right now, I seem to be stuck in the most basic of steps, starting it up. Following the guide, I am at the point where I have to "Specify the URL to your ArcGIS Online organization", which I do, getting the successful green check:
and then I hit continue, which takes me to
And I just keep looping between these two screens.
What should I try to move past this?
I see that you are defining your Portal url as http protocol are you running WAB Dev as http as well? If you are running it as https then that would be the issue.
For anyone else that runs into this problem, we used to restart that machine and it would go away. Although this last time it continued to be stuck in the loop. To expand on what Robert identified, I went in to edit the signininfo.json file in the server folder. The URL was https://. I changed it to http:// and refreshed the browser. That worked but when I looked at the signininfo.json file again, it is back to https://. Will probably have the same issue in the future though at least we know what to change if restarting the machine doesn't work.
edit--- IE 11 still has the login loop, but Chrome (Version 69.0.3497.100 (Official Build) (64-bit)) loads the page. The new chrome has a lot more issues trying to display and work with WAB. i.e. not displaying the basemap, not fully loading the WAB, not finding the layers from our services, and needing to be refreshed twice before it fully loads everything that should be there. I used to copy the url to IE to do teh work but it is still stuck in the loop so it is not loading the WAB.