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KirchnerMatthias-1588 avatar image
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KirchnerMatthias-1588 asked ·

SharePoint 2016: RSS Viewer Web Part does not work after December 2020 Patchda

Dear all,

for the last 10 years, the RSS Viewer Web Part in SP2010/2013/2016 worked for us. After installing the updates from the 12/2020 Patchday, we have the following problem with all existing and and all new created RSS Viewer Web Parts: "An unexpected error occurred processing your request. Check the logs for details and correct the problem."

Any idea?

Best,

Matthias

office-sharepoint-server-administrationoffice-sharepoint-server-customization
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Searching with ULS for one of the URLs to an RSS site, I do not find an an entry. Searching for "rss" I find the following entry:

RssWebPart: Exception handed to HandleRuntimeException.HandleException System.ArgumentNullException: Value cannot be null. Parameter name: key
at Microsoft.SharePoint.WebControls.CacheObject.LoadDataFromCache(String key)
at Microsoft.SharePoint.WebControls.BaseXmlDataSource.GetXmlDocument()
at Microsoft.SharePoint.WebControls.SingleDataSource.GetXPathNavigatorInternal()
at Microsoft.SharePoint.WebControls.SingleDataSource.GetXPathNavigator()
at Microsoft.SharePoint.WebPartPages.DataFormWebPart.GetXPathNavigator(String viewPath)
at Microsoft.SharePoint.WebPartPages.DataFormWebPart.PrepareAndPerformTransform(Boolean bDeferExecuteTransform)

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I am seeing the same thing on our Sharepoint 2019 Testserver after installing the two updates for the December CU. RSS webparts not working, same message in the ULS logs.

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The same error on Sharepoint 2013 farm updated to 2020-12 CU:

12/17/2020 14:32:19.94 w3wp.exe (0x0B4C) 0x0E60 SharePoint Portal Server Web Parts 8imh High RssWebPart: Exception handed to HandleRuntimeException.HandleException System.ArgumentNullException: Value cannot be null. Parameter name: key at Microsoft.SharePoint.WebControls.CacheObject.LoadDataFromCache(String key) at Microsoft.SharePoint.WebControls.BaseXmlDataSource.GetXmlDocument() at Microsoft.SharePoint.WebControls.SingleDataSource.GetXPathNavigatorInternal() at Microsoft.SharePoint.WebControls.SingleDataSource.GetXPathNavigator() at Microsoft.SharePoint.WebPartPages.DataFormWebPart.GetXPathNavigator(String viewPath) at Microsoft.SharePoint.WebPartPages.DataFormWebPart.PrepareAndPerformTransform(Boolean bDeferExecuteTransform) a834989f-c287-10c2-52ef-ce62f749aacb

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sadomovalex avatar image
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sadomovalex answered ·

on December 2020 CU page it is said that it is necessary to install 2 patches to fully patch SP2016 - did you install them both?
Internally RSS viewer web part performs http calls to specified RSS url. If it uses https issue may be related with TLS version support. But it is only a guess. In order to say for sure check log (try to search by RSS url used in your RSS viewer web part and find correlation id. After that review filter records by correlation id in ULSViewer tool and locate actual problem)


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We install in general from this source: https://docs.microsoft.com/en-us/officeupdates/sharepoint-updates => for 2016 in December: KB 4486753 + KB 4486721, 16.0.5095.1000 => two files: sts2016-kb4486753-fullfile-x64-glb.exe and wssloc2016-kb4486721-fullfile-x64-glb.exe.

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EmilyDu-MSFT avatar image
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EmilyDu-MSFT answered ·

@KirchnerMatthias-1588
Try to re-add the RSS viewer web part in the page. If the issue persists, you could open a ticket with Microsoft for further help.


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Yes, we tried this already, but it didn't work, deleting and re-creating of an RSS web part doesn't help.

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EmilyDu-MSFT avatar image EmilyDu-MSFT KirchnerMatthias-1588 ·

@KirchnerMatthias-1588
Please follow below Microsoft official blog post to stay updated on this issue:

Trending Issue: SharePoint RSS web part is broken after installing December 2020 CU


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StefanGossner-MSFT answered ·
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