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DSS WSUS server fail to download Updates HTTP status 404: The requested URL does not exist on the server.

When managing a Downstream WSUS server , it may happen that when a patch is approved it tried to immediately download it form the source server (USS)

Sometime we see errors in event viewer stating that the the download failed

Event ID: 364

Content file download failed.
Reason: HTTP status 404: The requested URL does not exist on the server.

Source File: /Content/6E/72131F469F73C884B32124746BAFCA2C8E0A106E.cab
Destination File: E:\WSUS\WsusContent\6E\72131F469F73C884B32124746BAFCA2C8E0A106E.cab


 Event ID 10032

The server is failing to download some updates.

We also see following entries in softwaredistribution.log


 2016-09-26 07:53:29.287 UTC Warning WsusService.3 ContentSyncAgent.ProcessBITSNotificationQueue ContentSyncAgent recieved Failure for Item: f52f0b8a-2b22-43cf-933e-af8de6b11eb6, Item fails
2016-09-26 07:53:29.287 UTC Info WsusService.3 ContentSyncAgent.ContentSyncSPFireStateMachineEvent ContentSyncAgent firing Event: FileDownloadFailed for Item: f52f0b8a-2b22-43cf-933e-af8de6b11eb6
2016-09-26 07:53:29.444 UTC Info WsusService.3 ContentSyncAgent.ProcessBITSNotificationQueue Requested USS DownloadFiles for file missing: http://1.1.1.1:8530/Content/B8/BCF3C45A1CF1AD3D572A83E84F54B742FA308DB8.cab
2016-09-26 07:53:29.444 UTC Info WsusService.3 EventLogEventReporter.ReportEvent EventId=364,Type=Error,Category=Synchronization,Message=Content file download failed.




What i have noticed is a retry after sometime fixes this, it appears that when the DSS tries to download he updates from USS , USS is already busy downloading form the Internet , so some files which DSS is requesting from USS have not been downloaded yet cause the error on DSS.

In this case time is what you need . 

I have seen that error disappears itself after DSS retries the download at later point in time.

Hope this helps

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