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Ubuntu Instance Can't connect to MQTT service on port 1883

in Linux

APPLIES TO:

Oracle Cloud Infrastructure - Version N/A and later

Information in this document applies to any platform.

SYMPTOMS

Oracle cloud server running a MQTT service using port 1883 and now we cannot connect from public and private network to this server port 1883

CHANGES

 MQQT services was configured on Ubuntu instance and port 1883 was open to the Security List

CAUSE

 By default all OS images on OCI will come with iptables configuration blocking all the services except the port 22.

SOLUTION

  1. Verify current IPTABLE rules:
root@ubuntu:~# iptables -L

 2. Add a rule to enable port 1883 for external connections :

root@ubuntu:~# iptables -I INPUT -p tcp -s 0.0.0.0/0 --dport 1883 -j ACCEPT
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