Port process down

When a monitor reports a port is down, there can be two possible causes:

1. The process listening on that port is down:
   • Handle this as an AMA - Process Down (docker-swarm) issue.
2. The port is open but does not accept connections from other nodes, which causes the monitor to fail:
   • Check the connection locally first using telnet.
   • Check the connection from another node (if applicable).
   • Verify the firewall (iptables):
     • Run iptables -L.
     • If the port is blocked by the firewall:
       1. Save the current iptables rules:

          iptables-save > /etc/network/iptables.rules

       2. Modify the rules to allow connections to that port according to your policy.
       3. Apply the updated rules:

          iptables-restore < /etc/network/iptables.rules

   • If the port is configured to listen only on localhost (127.0.0.1), escalate to the solutions team to reconfigure the process to listen on all interfaces (0.0.0.0).