Error 0xC8000403

Value: -939523069 | 0xC8000403 | 3355444227

What does it mean ?

hrTooManyOpenDatabases  
There are too many open databases.
Value: 1027 | 0x0403 | 0b0000010000000011

Where does it come from ?

FACILITY_NTDSB  
Active Directory Domain Services
Value: 2048 | 0x800 | 0b100000000000

Other Errors for FACILITY_NTDSB