The Network Adapter could not establish the connection?

[Roshan]

Oracle DB 19c

Hi Erman,

can you please advise why error is coming.

The Network Adapter could not establish the connection.

telnet is working fine.

Regards,

Roshan

[ErmanArslansOracleBlog]

Telnet just checks the listener ip and port.. It just provides a way for reaching the port, seeing if the listener is listening..

Give me more details about that "The Network Adapter could not establish the connection." error.. This is probably related with the config. These errors generally produced due to the driver incompatability, an error or some insufficiency in Oracle database ,TNSnames (TNS entries, service names ...), jdbc connection string, a not resolve-hostname and so forth.

We got to have all the details to pinpoint the cause.

[Roshan]

I tried to tracert the IP of the target. It says timeout. Most probably firewall blocking.

[ErmanArslansOracleBlog]

tracert to what port? ICMP? If so, that's something different. but you said telnet is working? telnet <listener_ip> <listener_port> --> if that's working; then it doesn't seem like a firewall issue..