Adding an external feed.

This is simple newbie question.

I am creating a newtork of drupal sites that will be feed by RSS coming from a central drupal site. The the most important thing is to be able to create a feed from the central site.

I go to create content and then aggregator2 , I begin filling out the information, but they ask for a URL.
Since the is feed was coming from outside I have a URL which I add and fill out the rest of the info. When I hit preview it shows the that everything is ok.

However, when I hit submit (I get the below).

Feed hosted at

Feed currently contains
0 items

Last checked feed host
never

Time until next refresh
never

The results do not show that the url "took" so when I refresh, I get a "fail to parse
RSS feed error" I have used 5 different feeds that I know are working but I get the same result.

Ideas.

Thanks

profezor