GroupShare2020 :: 400 Error when logging in to GS2020 externally

Question

Dear Support Team, 
 I've set up GroupShare2020 on my test box - everything works perfectly fine when I access admin web console locally (localhost). However, if I try to access it from outside (via domain name), I get the following error: 
 
 I cannot find any error messages in the log files (\ProgramData\SDL\Service\Logs). 
 I applied Symantec firewall rules according to this article. Additionally, 80 and 443 ports are opened on the router's firewall. 
 Could you please give a guidance if I'm missing anything? 
 Thank you!

Eugene Barkalov · Answer

OK, I was able to resolve my problem. The cause was that my domain name could not be resolved by GroupShare physical server. To make it work, I mapped my domain name to 127.0.0.1 (localhost) in "C:\Windows\System32\drivers\etc\hosts" file.

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GroupShare2020 :: 400 Error when logging in to GS2020 externally