Get data from Sharepoint site in different farm using webservice, and current site using claims mode authentication.

Hi , 

I have a site that runs on   Claims Mode (  NTLM) . That site has a web part that needs to show the data from any  sharepoint farm, SharePoitn  2010 , or 2007 or 2003.

I am getting 401 unauthorized when I   try to get data from webservice running in sharePoint context.

But when I run the same code in  Windows Console application  then it is giving no error.

What I doubt is that this issue is due to the reason that I have  set claims mode authentication.

Because same code is running  in different farm in a site that is configured  using windows authentication.