Lose SSH Access to Ubuntu 22.04 Instances

Question

Hello, I would like to know if anyone has experienced the following case. I have three Ubuntu 22.04 instances that have lost access via SSH to port 22. Not even via EC2 Instance Connect.
Message: Failed to connect to your instance
EC2 Instance Connect is unable to connect to your instance. Ensure your instance network settings are configured correctly for EC2 Instance Connect. For more information, see Set up EC2 Instance Connect at https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-set-up.html.

Answer

![Enter image description here](/media/postImages/original/IM5NN6LcnbSYitWHkpA2LdLg)
In order for **Instance Connect** to work, you need to add the Instance Connect **IP range** into your **security group** for **incoming SSH** connections. The IPs below is where the SSH connection will originate from depending on the region in which you're working. Make sure to only pick one. Your instances also **MUST** have a public IP address.

**USA**
- us-west-1        |  13.52.6.112/29
- us-west-2        |  18.237.140.160/29
- us-east-1        |  18.206.107.24/29
- us-east-2        |  3.16.146.0/29

- us-gov-west-1    |  15.200.28.80/30
- us-gov-east-1    |  18.252.4.0/30

**Canada**
- ca-central-1     |  35.183.92.176/29

The ranges are published in this official JSON file:
https://ip-ranges.amazonaws.com/ip-ranges.json

**Example:**
{
"ip_prefix": "18.252.4.0/30",
"region": "us-gov-east-1",
"service": "EC2_INSTANCE_CONNECT",
"network_border_group": "us-gov-east-1"
},

Answer

The other option to connect to your instance is through AWS Session Manager:
https://docs.aws.amazon.com/systems-manager/latest/userguide/session-manager-prerequisites.html

Some pre-requisites:
- Your instance must have a network path to the public endpoint for AWS Systems Manager, either through Internet Gateway, NAT Gateway or private endpoint.
- Your instance must have a role attached to it with the following managed IAM permissions: AmazonSSMManagedInstanceCore
- Must have SSM agent installed, it should already be pre-installed on your ubuntu image.

The session manager option is right up there in the console where Instance Connect is.

Lose SSH Access to Ubuntu 22.04 Instances

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