page not found error

[Zainal Arifin (BLOOMBERG/ 731 LEX)]

Hi, I don't know what's going on but last week this was working fine.
I can open Chrome browser and type dev machine url with port 8080, i.e. 
http://foobar:8080, and it'll redirect to http://foobar:8080/index.html and 
showing the Storm UI.
However, now I always got error "Page not found" :-( I looked at Storm 
nimbus.log and ui.log, and didn't see any error. The topology is still running 
as I see events in the log.
Any idea for me on how to troubleshoot this problem? Thanks!