port 22: Connection timed out

Hello,

Generally for connection timed out issues, following are the reasons -

• The instance's IP address or hostname is correct.
• The instance is passing its health checks.
• The security group of the instance allows incoming traffic on TCP port 22.
• The network ACLs of instance subnet allows incoming traffic on TCP port 22 and allow ephemeral port for the outgoing traffic.
• The route table of the instance’s subnet is configured properly to provide connectivity between EC2 instance and the SSH client. vThere isn't a firewall blocking the connection between SSH client and the EC2 instance.
• SSH isn't blocked by TCP Wrappers in the instance.

Additionally, I do want to point out that AWS blocks outbound traffic on port 25 (SMTP) of all EC2 instances and Lambda functions by default.

https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/

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According to your specific usecase, I installed docker-compose and installed Mailu afterwards to recreate the issue. However, I currently didn't run into any SSH errors even after installing the mailserver on the Amazon Linux 2.

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In case if you are still facing this issue, we will need to troubleshoot based on your configurations. Could you please create a support case with our Premium Support team directly so we may discuss details on your resource configurations?

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