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If you’re experiencing SSH connection timeouts, there are a few extra steps you can take to troubleshoot the problem effectively.
First, double-check your route table settings. Make sure there is a route directing traffic to an internet gateway for your public subnets. Without the correct routing, your server won’t be reachable from the internet, regardless of how the security groups and network access control lists (NACLs) are set up.
Next, verify that your security group rules allow SSH traffic from your current IP address. Sometimes your IP address may change, or the rules might be too restrictive. Ensure that port 22 is open for inbound connections from your actual source IP so that your device can connect without issues.
It’s also important to confirm your network ACLs permit outbound traffic on ephemeral ports, which usually range from 1024 to 65535. Since ACLs are stateless, both inbound and outbound rules need to be correctly configured for the connection to succeed.
Additionally, make sure you’re using the correct username for your instance. For example, use “ec2-user” with Amazon Linux, “ubuntu” with Ubuntu, or “admin” with Debian. Using the wrong username can cause connection issues even if everything else is properly configured.
Since you mentioned you can connect between instances with correct key setup, the problem is likely related to network configuration rather than the server itself. The fact that the issue occurs across different regions and instance types suggests a networking setup problem.
Try testing your connection from a different network or location. This can help determine if your current network or internet service provider is blocking outbound SSH connections. This simple step can often reveal where the problem lies.
For additional guidance, check out detailed troubleshooting resources on AWS documentation and community forums. They offer valuable insights to help you resolve connection issues quickly.
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