i think that is a problem in the feedexplorer you are using. If the url returns something when you enter the url in the browser, thats all you can expect from the core. Please verify that the feedexplorer supports the rss version as used by the core (that might not be the newest one). you might need to use a different news feed module to display the feed (eg. the dnn news module, or one of the commercial ones that are available)

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I will answer myself :-)

The problems I've had with the syndication of standard dnn modules and use of the default feed explorer :

1. No syndication with modules 
   Erik explained; enable search indexer. Problem solved
   
2. Syndication with modules, but no output in feed explorer
   Fiddler revealed call from the feed explorer to fe3.pipes.re3.yahoo.com, I guess that from that place the rss feed (the syndication) is accessed.
   problem here is that the website I am talking about is an Intranet site not accasible from the outside :-)

For now I've decided to leave the explorer for what it is, also due to the fact that the search datasource of dotnetnuke is used (I guess you can't just show the current items of an announcement module, you will see all of them, current, expired, future ?)

Thanks for reading this thread anyway

Pepijn