Just set up hudson on an internal server xx.xx.xx.com:8080/rssAll.

A red caution sign shows in the status bar, with the message "An unexpected
error has occurred while parsing response text. Please enable debug and check
the log via Error Console." In the error console, I see

BuildMonitor [Thu May 28 10:47:49 2009][main]: An unexpected error has occured
while parsing response text. Exception: TypeError:
container.getElementsByTagName(name)[0].childNodes[0] is undefined

However, next to this red caution icon, I get another icon that seems to
correctly show the status of my build.