activate port 3000
Summary
not able to telnet to port 3000 from internetContent
This is what I have done for testing:
1.disable the firewall :
[root@instance-20190809-1438 ~]# sudo firewall-cmd --permanent --add-port=3000/tcp
success
2. Add ingress rule to allow all traffic(from source 0.0.0.0/0) with all protocol.
3. Start a session#1, created a socket as :
[root@instance-20190809-1438 ~]# nc -l 3000
4. On session#2 started from the same compute node, I'm able to telnet to it:
[root@instance-20190809-1438 ~]# telnet localhost 3000
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
5. On session#2, netstat confirms port 3000 is active:
[root@instance-20190809-1438 ~]# sudo netstat -apn |grep 3000
tcp 0 0 0.0.0.0:3000 0.0.0.0:* LISTEN 13885/nc
6. Within Oracle VPN, try to telnet from my laptop failed: