OT: Thunderbird refuses to attach some news feeds

[carlopmart]

Hi all,

 I have a strange problem with my thunderbird email client under SL6.1. 
When I try to add this feed:

 http://blogs.oracle.com/observatory/en_US/feed/entries/rss

 thunderbird refuses to store this link showing this error: 
"http://blogs.oracle.com/observatory/en_US/feed/entries/rss is not a 
valid feed". Firefox doesn¡t have this problem. Where it can be the 
problem??

Thanks.

--
CL Martinez
carlopmart {at} gmail {d0t} com