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https://synkventures.com/2017/03/25/sharepoint-issue-resolution-portalsitemapprovider-was-unable-to-fetch-children-for-node-or-unexpected-system-web-httpexception-request-timed-out-sharepoint/
SharePoint issue resolution - PortalSiteMapProvider was unable to fetch children for node or Unexpected System.Web.HttpException: Request timed out #SharePoint