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

Matthias68 191

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

Matthias68 191 Reputation points

2020-12-16T20:52:22.223+00:00

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)
Wimmer Christian 16 Reputation points

2020-12-17T13:20:38.67+00:00

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.
Marcin Hanczaruk 1 Reputation point

2020-12-17T15:39:21.19+00:00

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
Samir 1 Reputation point

2020-12-18T09:56:00.097+00:00

We're seeing same behavior after December Patch as well. All patches were applied, and RssViewerWebPart is now shoing same error message. This is happening on our SharePoint 2010 as well.
Emily Du-MSFT 41,786 Reputation points Microsoft Vendor

2020-12-21T01:46:14.33+00:00

@Wimmer Christian @Marcin Hanczaruk @Samir
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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3 answers

Stefan Goßner 656 Reputation points Microsoft Employee

2020-12-18T20:20:29.697+00:00

Please follow this blog posts to stay updated on the issue:
https://blog.stefan-gossner.com/2020/12/18/trending-issue-sharepoint-rss-webpart-is-broken-after-installing-december-2020-cu/
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sadomovalex 3,626 Reputation points

2020-12-16T20:16:01.903+00:00

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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Matthias68 191 Reputation points

2020-12-16T20:44:59.297+00:00

We install in general from this source: https://learn.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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Emily Du-MSFT 41,786 Reputation points Microsoft Vendor

2020-12-17T06:40:21.993+00:00

@Matthias68
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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Matthias68 191 Reputation points

2020-12-17T08:44:36.79+00:00

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

Emily Du-MSFT 41,786 Reputation points Microsoft Vendor

2020-12-21T01:43:00.153+00:00

@Matthias68
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

If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
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