28. Network troubleshooting ‐ Two Server in the same subnet, There is issue to reach port on one of the server - SanjeevOCI/Ocidocs GitHub Wiki

Network troubleshooting - Two Server in the same subnet. There is issue to reach port on one of the server

Scenario - We have 2 instances in the subnet. They can reach each other on Port 22, but not on port 3050

1. Both ports 22 & 3050 are allowed in Ingress Rule. But still telnet to port 3050 is not working.

2. To allow access to the Port 3050, We need to install firewall in the server. This can be achieved by using the utility called firewalld. Use the below command to install firewalld, if not already installed

yum install firewalld

3. Check the status of Firewalld using "systemctl status firewalld". If not active, use the command "systemctl start firewalld" to activate it.

4. Add port to firewalld

5. List the ports

firewall-cmd --list-ports

6. Even after allowing Port 3050 in firewalld, telnet to port 3050 is not working. This is due to the fact that no application is listening on port 3050