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/Security Group Inbound Update Not Working/

Security Group Inbound Update Not Working


I recently added a new IP address to my security group to allow that IP address to access a EC2 instance within the group. After 24 hours, that new IP address is still not able to access the EC2 instance. Any help/advice would be appreciated.

asked 2 years ago16 views
3 Answers

Hi there,

Thank you for reaching out.

I can see that you are not able to access your instance.

Can you verify that the instance meets all prerequisites
The instance must meet the following conditions:

  • The route table that is associated with your instance’s subnet has a  default route to an Internet Gateway (0.0.0./0). 
  • The internet gateway that is associated with the route isn't deleted.
  • The security group that is attached to the instance’s elastic network interface has rules allowing outbound internet traffic ( for your ports and protocols.
  • The network access control list (network ACL) that is associated with the instance's subnet has rules allowing both outbound and inbound traffic to the internet.
  • Verify that the instance has a public IP address.

Please review the provided AWS documentation[1][2] for more information.

I hope the provided information helps. If it does not, please let me know if you have questions.

Have a great day!


answered 2 years ago

Thank you for your response. IIUC, all of the configurations you mentioned are already correctly set up. For some more context, I am trying to switch to a different ISP. The IP address from my old ISP and my new ISP are both in the inbound rules of my EC2's security group. However, I can only connect to the EC2 using the old IP address. I wonder if there is something else that I am missing, or if I should contact my ISP. Any additional help would be great, thanks.

answered 2 years ago

Never mind, turns out my new ISP does not give me a static IP address. I had to change it to the right one. Thanks.

answered 2 years ago

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