On linux with hostname: test, install jenkins  2.234-1.1 

everything works fine. http://test:8080

change the hostname to prod using hostnamectl

go to Manage jenkins => configuration => Jenkins URL

set the new URL: http://prod:8080

restart jenkins

http://prod:8080 is redirected to http://test:8080

The issue is not critical in HTTP but in HTTPS the SSL certificate become invalid