How can resolve this issue please help me.
SQL*Plus: Release 19.0.0.0.0 - Production on Thu Jun 12 13:04:45 2025
Version 19.3.0.0.0
Copyright (c) 1982, 2019, Oracle. All rights reserved.
Enter user-name: SYS
Enter password:
ERROR:
ORA-12543: TNS:destination host unreachable
Enter user-name: