Thanks for your feedback. We are releasing 5.14.1 beta with the fix right now.
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
This issue has been added to the tracker:
I'm sending you an email with a development version of WinSCP to the address you have used to register on this forum.
Can I see a log file please first? I want to see why the autodetection of region does not work.
So what do you need? Is there a way to detect the correct region to use? Or do you need WinSCP to allow configuring the region manually?
Allow detection for Commercial or GovCloud from the WinSCP Site configuration > Host-name.
Possible values are:
If there is a "gov" in the Hostname then
Region = us-gov-west-1
Region = us-east-1
Above should work