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I was changing the Security Group of my instance by right click and then "change Security Group" but it's not working.

Any help!

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It seems that your instance is EC2 Classic so you cannot change the security group of EC2 classic. Here first you need to migrate your instance to EC2-VPC and after that, you can change the security group whenever necessary.

Hope this helps!

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You can refer to the below video tutorial to know more about EC2 instances. 

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