Are EC2 security group changes effective immediately for running instances?

Posted by Jonik on Server Fault See other posts from Server Fault or by Jonik
Published on 2010-11-23T11:24:55Z Indexed on 2012/09/24 9:40 UTC
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I have an EC2 instance running, and it belongs to a security group. If I add a new allowed connection to that security group through AWS Management Console, should that change be effective immediately? Or perhaps only after restart of the instance?

In my case, I'm trying to allow access to PostgreSQL's default port (tcp 5432 5432 0.0.0.0/0), and I'm not sure if it's the EC2 firewall or PostgreSQL's settings that are refusing the connection.

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