During various search troubleshooting i came across the following crawling error in the Craw log of a SharePoint 2013 environment. Processing this item failed because of an unknown error when trying to parse its contents. (Error parsing document 'http://sharepoint.contoso.com/Project/abcd/Q_M/ABX/SitePages/Homepage.aspx'. Sandbox worker pool is closed.; ; SearchID = 820E86ZD-5252-4G5F-AK9U-2096ZV3L56PP ) In order to fix this you can try to perform the following action plan: Open "Local Policies” Click on “User rights assignment” Make sure that the search service account has the following rights: "Replace a process level token” "Adjust memory quotas for a process" "Impersonate a client after authentication" Please make sure that the policies don't get changed afterwards. After implementing the above changes please run a clear configuration cache After clearing the cache, start a full crawl and the erro