SSH connection timeout

Question

Hi.. I  am unable to ssh into my instance to make some php.ini setting changes.  I get connection timeout.  Here is what I have done:

- I am on a Macbook running BigSur 11.6
- I fully opened up SSH port 22 in Security Groups
- Instance type is t2.micro
- I have a public IP
- I checked that no firewall is blocking.
- I tried all the different usernames ubuntu, ec2-user, root.
- Keyfile has been chmod 400'd.
- My latest instance ID is i-0abb14d7fc4673fb1
- ssh command with ip zero'd out below:
       ssh -i "mypem.pem" root@ec2-0-0-0-0.us-east-2.compute.amazonaws.com

I have been chasing google fixes for two days now with no avail.  Thanks

Accepted Answer

Connection timeout is typically related to end to end network connectivity issue and not to username or file permission.
Have you followed the Knowledge Article guideline at: https://aws.amazon.com/premiumsupport/knowledge-center/ec2-linux-resolve-ssh-connection-errors/

Also do check that the subnet you deployed this EC2 instance into has route to Internet.

You can also try out the Session Manager instead of SSH connection as way to launch a secure connection into your Instance. Check out more here: https://aws.amazon.com/blogs/aws/new-session-manager/

Answer

Hi ! Thanks for using AWS re:Post and providing a brief description of the issue.

It seems that you have tried all the necessary steps for diagnosing the issue . 
I would suggest having a look at the Route table for the instance and making sure it has an internet gateway attached to it as you are trying to SSH to an instance using its public IP over the internet. 
Hence, the instance needs to be launched in a public subnet with an internet gateway in its route table (and not NAT gw) . 
If you need further help, Try opening a ticket with AWS support for their insights as well .

Reference :

[] Troubleshoot connecting to your instance  - Error connecting to your instance: Connection timed out - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html#TroubleshootingInstancesConnectionTimeout

SSH connection timeout

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