Cannot connect my EC2 instance via SSH in several minutes after starting it

Question

I have a pretty much the same issue described here https://repost.aws/questions/QUTwS7cqANQva66REgiaxENA/ec-2-instance-rejecting-connections-after-7-minutes and here https://repost.aws/questions/QUIrlxErTGSxesqwaawWBb-g/ssh-into-ec-2-stops-accepting-connections-after-about-8-minutes

My account was suspended in the past and re-opened so I suspect that this is the case.

Nothing from here https://aws.amazon.com/premiumsupport/knowledge-center/ec2-linux-resolve-ssh-connection-errors/ helped me.

Answer

Make sure that the security group is not allowing traffic from 0.0.0.0/0. That could indicate that you are getting brute forced and the instance has a hard time keeping up with all connection requests. If you are using Linux, you can install a tool like fail2ban which will automatically create firewall rules to block traffic from ip's that attempt to authenticate with invalid credentials.

If you truly believe that there is something wrong with your account, then you can open a ticket to the billing team as your repost link you referenced says.

Cannot connect my EC2 instance via SSH in several minutes after starting it

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