Yeah,
I found this problem using Weblogic as application server some time ago .
I was using RSS portlet and trying to connect to a server which returned "text/html" as content-type in the header but the XML returned used UTF-8 as encoding (<?xml version="1.0" encoding="UTF-8"?>), in this case server should be returned "text/html;charset=UTF-8".
If you could use a RSS validator you could be able to check if you are in this situation (you can check this manually if you can't use the validator for that URL), for example the following URL validates RSS feeds:
http://feedvalidator.org/In these cases the validator returns:
Feeds should not be served with the "text/html" media type
Your feed appears to be encoded as "UTF-8", but your server is reporting "US-ASCII" Good luck!!