In the RssProvider we apply a filter which has the following rule
publicationFieldName is less or equal than DateTime.Now
expirationFieldName is Greather than now.
The filter applies when the provider is initialized which happens when someone makes a request to the rss page you have
You can try the following
Create a new item and check if it is shown in the feed. If not try restarting the web server. If you fetch some data from one location to another( or there are difference in the data format set for the database server) make sure that there is not an issue with the publication and expiration date of the item. Also the news item should be Published.
It is quite strange that you see the item in the NewsView control, but not in the Rss. We use GetContent method and one of its overloads to get the content data, so there should not be a difference.
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