I ran across some comments in a different forum suggesting that the file ntdll.dll, were it to have become corrupt, could account for a failure of the SQL job engine that BE 12.5 uses and therefore create communications problems similar to what I continue to experience. Does anyone have a clue as to how I can verify the integrity of this file. It shows up in System32 and in the cache as version 5.2.3790.4455 with annotation srv03_sp2_gdr, with size 774,144 bytes and date of creation 4/23/07 .