SharePoint Collector action fails with error "The remote server returned an error: (401) Unauthorized"

SYMPTOMS

You are collecting from the root of SharePoint 2010 and observe that the SharePoint Collector action fails. In the Execute Performer log, in debug mode, you find an error message that resembles the error below:

2015-09-04 11:46:03,913 MACHINENAME [13][5500] DEBUG ZyLAB.EDiscovery.Collectors.SharePoint.SharePointCollector - Call OnDocumentCollected
2015-09-04 11:46:03,913 MACHINENAME[13][5500] DEBUG ZyLAB.EDiscovery.ProcessingService.Common.Collection.ExecuteCollector - In OnDocumentCollect identification /_catalogs/wfpub/Collect Signatures - SharePoint 2010\Signatures_Task_1033.xsn, action 5789
2015-09-04 11:46:03,913 MACHINENAME[13][5500] ERROR ZyLAB.EDiscovery.ProcessingService.Common.Collection.ExecuteCollector - Provided document has error
2015-09-04 11:46:03,913 MACHINENAME[13][5500] ERROR ZyLAB.EDiscovery.ProcessingService.Common.Collection.ExecuteCollector - Error in document collect, action 5789, identification /_catalogs/wfpub/Collect Signatures - SharePoint 2010\Signatures_Task_1033.xsn
ZyLAB.EDiscovery.Collectors.SharePoint.Exceptions.SharePointCollectorException: Error downloading SharePoint data. ---> System.Net.WebException: The remote server returned an error: (401) Unauthorized.

CAUSE

When using SharePoint 2010, SharePoint also serves files that are system files or internal to SharePoint. The path to those locations typically start with [root]/_[internalpath] or [root]/[site]/_[internal path]. When accessing these locations, the unauthorized message will be logged and the next location will be tried. The action in Legal Processing will be logged as failed as the collector has tried to collect files SharePoint serves but are not typical content libraries.

RESOLUTION

• The SharePoint collector does not support collection of “Site Assets” (unless explicitly included into Libraries list in collector settings), collection of Tasks and Calendar items.
• Specific to SharePoint 2013; The SharePoint collector does not support collection of old versions of documents from SharePoint 2013.
• Ensure you specify the URL to a site in the SharePoint Collector configuration and add the library/libraries you wish to collect.

APPLIES TO

3.2; 3.4; 3.6; 3.7; 3.7 Service Pack 1