Error 0x8009400F

Value: -2146877425 | 0x8009400F | 2148089871

What does it mean ?

CERTSRV_E_NO_DB_SESSIONS  
An attempt was made to open a Certification Authority database session, but there are already too many active sessions. The server may need to be configured to allow additional sessions.
Value: 16399 | 0x400F | 0b0100000000001111

Where does it come from ?

FACILITY_SSPI  
Used for status code returned by Security Support Provider Interface (SSPI)
Value: 9 | 0x009 | 0b00001001

StackOverflow

Other Errors for FACILITY_SSPI