SCCM 2007 Client was failing to download the files In the logs i could see the following errors Error sending DAV request. HTTP code 503, status 'Service Unavailable' DataTransferService 08-05-2016 12:22:43 49788 (0xC27C) GetDirectoryList_HTTP mapping original error 0x8004027e to 0x800704cf. DataTransferService 08-05-2016 12:22:43 49788 (0xC27C) I checked the problematic DP and found "SMS Distribution Points Pool" Application Pool in IIS was stopped I couldn't see any event in the application logs, so i just stared it up manually. The download worked after that Also you may try iisreset Hope this helps