JDBC pool error


When I am testing JDBC pools, always getting below error and it is intermittent. Can anyone help me on this?

[sag-cjdbc42-0011][Oracle JDBC Driver][Oracle]Connection refused, (DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12516)(ERROR_STACK=(ERROR=(CODE=12516)(EMFI=4))))

Satish Devineni

Seems like an issue with Oracle, either its not running or TCP/IP connectivity is not possible, e.g. firewall issue. Google is your friend!

it’s also possible that a firewall may block the connection.
If you are sure the Oracle is running, check with your network team.