Error 0x80072100

Value: -2147016448 | 0x80072100 | 2147950848

What does it mean ?

ERROR_DS_DRA_REF_ALREADY_EXISTS  
The replication reference information for the target server already exists.
Value: 8448 | 0x2100 | 0b0010000100000000

Where does it come from ?

FACILITY_WIN32  
Provides a way to handle error codes from functions in the Win32 API as an HRESULT. (Error codes in 16 - bit OLE that duplicated Win32 error codes have also been changed to FACILITY_WIN32)
Value: 7 | 0x007 | 0b00000111

Other Errors for FACILITY_WIN32