ping and traceroute tests will provide more information as to what may be going on. If you are unsure of how to read the results that are output by these commands, you may paste it within a comment to this or you can send it to firstname.lastname@example.org for more information.
From the comment you posted, it also looks like you are trying to pull RSS feeds from Microsoft's site. I was able to find an article on their knowledgebase that may have more information on fixing the problem:
RSS Feed Synchronization Error
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