When a Windows Server 2003 domain controller using BITS 2.0 attempts to download shared resources from a UNC path that points to itself, the download is unsuccessful.
This behavior occurs because BITS 2.0 interprets this UNC path as a direct disk I/O operation and does not use the Windows Server 20034redirector.
To workaround this behavior, you can use either of the following:
Map a drive letter to the shared resource and use the drive to perform the download.
Disable the shadow loopback feature:
1. Open a CMD.EXE Window.
2. Type the following command and press Enter:
REG ADD HKLM\SYSTEM\CurrentControlSet\Services\MRxSmb\Parameters /V DisableShadowLoopback /T REG_DWORD /F /D 1