after testing around i´ve got a few more informations

In total there are 4 cases
1.) Joomla SEF disabled
-> RSS Feed works with following URL:
index.php?option=com_content&view=category&layout=blog&id=90&Itemid=456&format=feed&type=rss

2.) Joomla SEF enabled, Add Suffix to URL diabled:
-> RSS Feed works with following URL:
/press/presscategory?format=feed&type=rss

3.) Joomla SEF enabled, Add Suffix to URL enabled:
-> RSS Feed DON´T work with following URL:
/press/presscategory.feed?type=rss

4.) Artio JoomSEF enabled, File suffix enabled (.html/.feed)
-> RSS Feed DON´T work with following URL:
/presscategory/rss.feed

5.) Artio JoomSEF enabled, File suffix disabled
-> RSS Feed DON´T work with following URL:
/presscategory/rss

So i think it is related with the Joomla Option "Add suffix to URL", but if i work with ARTIO JoomSEF it don´t work in both cases..
i hope this was helpfull
cheers

Hello

i have the same problem with ARTIO JoomSEF and Joomla RSS Feeds
If i click the feed logo in the adress bar the page reloads but shows the same page again instead of the RSS Page

i also checked the JoomSEF URL Manager and following URLS are saved:
SEF URL:
groupdecontent/rss.html
NON SEF URL:
index.php?option=com_content&format=feed&id=90&layout=blog&type=rss&view=category&Itemid=456

if i disable JoomlaSEF
the following url works: and i get the correct RSS page
index.php?option=com_content&view=category&layout=blog&id=90&Itemid=456&format=feed&type=rss

can you please help me?