-By default, each subnet uses the default security list for the VCN. That default security list has a set of default rules - see [Security Lists](https://docs.cloud.oracle.com/iaas/Content/Network/Concepts/securitylists.htm#default-list) for details. By default, TCP traffic on destination port 22 (SSH) will be open from any source port. This will enable you to easily launch a Linux instance and connect via SSH. However, please note that by default Remote Desktop Protocol, RDP, will not be accessible. If you are using a Windows image, you have to add a stateful ingress rule for TCP traffic on destination port 3389 from any source port. The rules in the default security list can be modified in Terraform by using the `oci_core_default_security_list` resource - see [Default Resources](https://github.com/oracle/terraform-provider-oci/blob/master/docs/Managing%20Default%20Resources.md).
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