Hello,
I have been unable to connect to a remote single instance Oracle 12.1 database on redhat 6. (using GUI clients)
Do I need to open this port? I am under the impression that the port is considered "open" if it is listening from netstat results. please advise.. thank you
netstat -tanp | grep LISTEN shows
tcp 0 0 :::1523 :::* LISTEN 59945/tnslsnr
nmap -sS hostname
Not shown: 994 closed ports
PORT STATE SERVICE
22/tcp open ssh
1556/tcp open veritas_pbx
2222/tcp open EtherNet/IP-1
2301/tcp open compaqdiag
2381/tcp open compaq-https
13782/tcp open netbackup