Connecting to Amazon Web Services (AWS) instances with PuTTY is a common essential function for cloud infrastructure management. A connection timeout error, on the other hand is irritating. This error can occur due to variety of reasons, including network configurations, security settings, or instance-specific issues. In this article, we will explore steps to resolve connection timeout error.

 Also check Connect Windows EC2 Instances to RDS Databases using PuTTY.

                   Encounter "Server host key did not match the singnature supplied" error in AWS.

Check Security Groups:

Ensure that the security group associated with your AWS instance allows incoming SSH traffic.

Confirm that the source IP address is set to accept connections in the security group rules.

Check the network ACL:

If you use network ACLs in your virtual private network, make sure they allow inbound and outbound SSH traffic.

Check the Route Table:

Verify that the route table associated with your subnet has a route to the internet gateway.

Check the Internet Gateway:

Make sure that your VPC is integrated with an internet gateway.

Check the Subnet Route Table and Network ACL:

Check that the route table and network ACL, allow communication with the internet if your instance is in a private subnet.

Check Instance State:

Verify that your AWS instance is running.

Check Elastic IP address:

If you're using an Elastic IP, make sure it's linked to your instance and properly configured.

Check the Key Pair:

When connecting with PuTTY, make sure you're using the correct private key.

In conclusion, troubleshooting steps should involve a thorough examination of security configurations, network settings, and key authentication. It is critical to ensure that security groups, network ACL, and route tables are properly established. Furthermore, using the correct private key with PuTTY and confirming the availability of public IP or Elastic IP are critical components of a successful connection.