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We have SharePoint 2013 on-prem and I recently applied Windows security patches from October 2020. Since then, whenever we search on SharePoint for anything other than 'this site', this error is returned:

The base type 'Microsoft.Office.Server.Search.Internal.UI.SearchResultsLayoutPage' is not allowed for this page. The type Microsoft.Office.Server.Search.Internal.UI.SearchResultsLayoutPage, Microsoft.Office.Server.Search, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c could not be found or it is not registered as safe.

I've found posts about others with this issue and tried their attempted fixes, notably updating the web.config file on all SharePoint servers to include the above, however it still is not working.

Does anybody have a successful resolution of this?

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Have you tried with updating the SearchResults.aspx page layout referring to this post: SearchResultsLayoutPage error in enterprise search site after SP1 and several CU's installed all at once?

You can also try resetting the site master page via Site Settings > Reset to site definition > Reset specific page to site definition version ( _layouts/15/reghost.aspx ).

Another reference on this issue: [Fixed]: The page ‘catalogs/DeviceChannelMappings.aspx’ allows a limit of 11.

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  • Thank you Chelsea_MSFT, updating the SearchResults.aspx fixed the issue :)
    – MKPHX
    Commented Apr 6, 2021 at 21:45

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