Error 0x80040D9F

Value: -2147218017 | 0x80040D9F | 2147749279

What does it mean ?

Alerts failed because of network failures or because the internal cache size was exceeded. If the problem persists, change the content source type to adaptive or crawl.
Value: 3487 | 0x0D9F | 0b0000110110011111

Where does it come from ?

COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

Other Errors for FACILITY_ITF