Fatal NI connect error 12170.

  VERSION INFORMATION:
	TNS for 64-bit Windows: Version 11.2.0.4.0 - Production
	Oracle Bequeath NT Protocol Adapter for 64-bit Windows: Version 11.2.0.4.0 - Production
	Windows NT TCP/IP NT Protocol Adapter for 64-bit Windows: Version 11.2.0.4.0 - Production
  Time: 09-FEB-2021 18:29:40
  Tracing not turned on.
  Tns error struct:
    ns main err code: 12535
    
TNS-12535: TNS:operation timed out
    ns secondary err code: 12560
    nt main err code: 505
    
TNS-00505: Operation timed out
    nt secondary err code: 60
    nt OS err code: 0
  Client address: (ADDRESS=(PROTOCOL=tcp)(HOST=**.**.**.**)(PORT=60521))