Oracle error
ORA-12170
ORA-12170: TNS:Connect timeout occurred
What usually causes it
The client couldn't reach the listener in time: a firewall dropping packets, an unreachable host, or a network problem.
What to check first
Test the port with nc -vz host port from the client. Check firewalls between client and server.
Tool
- Connection string builderEZConnect, tnsnames.ora, JDBC, psql, sqlcmd and more