could you send me the conclusions? I have this exact same issue and have posed it to this forum before and no one ever responded. In fact, I brought this up at the recent Wash D.C. Sharepoint Summit and it seems to be stumping even the best!

i am working on a solution that says that you need to provide proxy
authentication. once i check on this i'll confirm. if you make any headway in
this please let me know.

I don't have a proxy  server to test out your situation. Does that problem  go
away when you are not using a proxy server? If so, you probably need to
enable Basic authentication in the IIS Web Site. Just a thought.

i found a way to bypass the proxy  authentication error. i wrote my own webpart.
The webpart is very basic only has the renderwebpart am working on improving it
by providing properties rather than hardcoding the username, password,
proxyaddress, etc.

and this works.....;-)))

protected override void RenderWebPart(HtmlTextWriter output)

{

try

{

string userName = <username>;

string password = <password>;

string proxyAddress = <proxyAddress:port>;

WebProxy myProxy = new WebProxy();

Uri newUri=new Uri(proxyAddress);

myProxy.Address=newUri;

myProxy.Credentials=new NetworkCredential(userName,password);

WebRequest objRequest = WebRequest.Create("<rss URL>");

objRequest.Proxy = myProxy;

WebResponse objResponse = objRequest.GetResponse();

XmlDocument feedXML = new XmlDocument();

feedXML.CreateElement("XML");

StreamReader sr = new StreamReader(objResponse.GetResponseStream());

feedXML.Load(sr);

XslTransform trans = new XslTransform ( );

trans.Load ( "<xslt file>" );

trans.Transform(feedXML,null, output, null);

}

catch (XmlException err)

{

//error handling

}

for those who are interested I have developed a RSS feed webpart which solves
the proxy  authentication problem

i am attachIng the cab file do use it and tell if it solves ur problems. it
takes as properties, the rss feed url, the xslt file path, username, password
and the proxy address.

How exceptionally unfortunate that we have an out of the box web  part and no one can figure out how to run it.

I think we should look at the identity of the Application Pool controling the
sharepoint application. cos. i tried to access rss feed from a web  app, win app
and a webpart just to see what errors each one is throwing at me. the
underlying the problem  is proxy  authentication. One error  told me that Network
Service is not authorised to do this action. so I came to the conclusion that
it was not taking my login. i am sort of tied up in another work. if u have
time do look at this angle and let me know in case u find something.