Unable to login to ADS01 (Unknown Reason (null))

Technical Support
7

Be sure that you’ve configured your reverse proxy properly, specifically this command:
ampinstmgr reconfigure ADS01 +Core.Webserver.UsingReverseProxy True
(seen this fix the error for someone else)

https://discourse.cubecoders.com/t/setting-up-secure-http-https-with-amp/2305#h-2-reverse-proxy-on-windows-5