Instance not connect

When facing issues connecting to an EC2 instance, whether through EC2 Instance Connect or an SSH client, there are several potential causes and solutions to explore:

1. Security Group Settings: Ensure the security group attached to your EC2 instance permits incoming SSH traffic (port 22) from your IP address. This is a common oversight that can prevent successful connections.
2. Key Pair Mismatch: Verify that the key pair used to launch the instance matches the one you're using to connect. A mismatch here can lead to failed authentication attempts.
3. Instance State: Confirm the instance is running. An instance that is stopped or terminated will not accept SSH connections.

For SSH client-specific issues, such as the "Identity file name of my sshkey.pem not accessible" warning, ensure the path to your .pem file is correct, the file permissions are set correctly (readable by the user), and the key pair matches the instance's requirements.

Looking at this from the Instance Connect side, can you check that you have met all the pre-requisites https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-prerequisites.html

That includes having the Instance Connect software installed on your instance https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-set-up.html

On the SSH client side, which SSH client software is it that you are using?

The fact that youi're getting the message Warning: Identity file name of my sshkey.pem not accessible: No such file or directory suggests that it's getting as far as the key-exchange step, which suggests the initial SSH connection on port 22 is succeeding, indicating the network is good.

Hello,

Try checking and correcting the permissions of your private key file (sshkey.pem) using the command chmod 600 sshkey.pem. Also, ensure you are executing the SSH command from the correct location where the key file is stored.

For the EC2 Instance Connect related issue, refer to this document:

[+] https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-set-up.html