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In SharePoint 2013,i added the web part for RSS viewer in my homepage in my development server and gave the link http://www.channelnewsasia.com/rss/latest_cna_frontpage_rss.xml. encountered an error "An unexpected error occurred processing your request, check the logs and correct the problem.

I checked the logs at C:\Program Files\Common Files\Microsoft shared\Web Server Extensions\15\LOGS with the ULS viewer. didnot understood the advise me how to resolve.

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The RSS viewer web part is a quick and easy way to integrate external live content into a SharePoint portal. However, this seemingly simple web part appears to be causing trouble for a lot of people. Quite often it simply does not work straight off the bat because additional configuration is required.

First of all, if your environment is using a proxy server to access the Internet then the proxy details need to be added to the web.config file. Refer to this post on how to do this. If you have not configured this you will see the error "An unexpected error occured processing your request. Check the logs for details and correct the problem."

Once you have put in the proxy details in the web.config file you may hit another wall with the error "proxy authentication required" displayed in the web part. And this is despite the current user can access the feed directly in a browser.

The RSS viewer web part uses authentication delegation and is using the current user's credentials to access the proxy. However, the RSS viewer only supports anonymous and Kerberos authentication. So if you are using NTLM authentication the RSS viewer will not be able to authenticate the user through the proxy.

What you can do in this case is adding exceptions to your firewall so it will not prompt for authentication for certain URLs. The unfortunate downside of this of course is that every time a user adds a new RSS feed to a page the user needs to request the IT department to reconfigure the firewall.

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