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OCI : Unable to Access TCP Port in Ubuntu Instance (Doc ID 2604769.1)

Last updated on FEBRUARY 17, 2021

Applies to:

Oracle Cloud Infrastructure - Version N/A to N/A [Release 1.0]
Linux x86-64 on Oracle Public Cloud


  1. An application is configured to listen for connections on a TCP port (e.g. 10000) in the instance.
  2. There are active ingress rules in the instance VCN to allow incoming traffic to port 10000/TCP in the OCI Cloud Console.
  3. This is a standard Ubuntu 18.04 LTS instance with the ufw disabled and stopped
  4. The application is active and listening on all IP addresses ( for the port 10000 in the Ubuntu instance.




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