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I have an Internet facing SharePoint 2010 site collection which has anonymous access enabled, the list is set to view items for anonymous users. The anonymous users can view the list, but when you click on the RSS link it throws the infamous SharePoint error “An unexpected error has occurred”

e.g. Site URL

List URL:

Feed URL:{GUID}&

From the ULS logs this what I found:

System.FormatException: Input string was not in a correct format.   
 at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer&     number, NumberFormatInfo info, Boolean parseDecimal)    
 at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)    
 at Microsoft.SharePoint.SPChangeToken.ParseChangeToken(String strChangeToken)    
 at Microsoft.SharePoint.SPChangeToken..ctor(String strChangeToken)    
 at Microsoft.SharePoint.ApplicationPages.ListFeed.get_NeedToFetchItems()    
 at Microsoft.SharePoint.ApplicationPages.ListFeed.OnPreInit(EventArgs e)    
at System.Web.UI.Page.PerformPreInit()    
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,     Boolean includeStagesAfterAsyncPoint)

Now internally on the network, the anonymous site works and the users can subscribe to the list RSS without the need for users to authenticate. We are behind a proxy server and this has been added to bypass in the web.config.

The internet site available over also site behind a firewall but the only exception being the users cannot authenticate if the request comes from outside of our network.

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I don't think ASPX application pages are accessible via anonymous access, but could be wrong.

Try this article: Allowing Anonymous Read Access to SharePoint RSS Feeds

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Some of the information contained in this post requires additional references. Please edit to add citations to reliable sources that support the assertions made here. Unsourced material may be disputed or deleted.

If found this to be a issue with SP code it was fixed in October 2014 CU. It seems to work now. – MicrosoftDevX Feb 5 '15 at 1:54

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