Which AWS service provides high availability when there are at least two ports open and allows remote server connections?

The answer is AWS Direct Connect. This service provides a dedicated network connection from your on-premises data center to AWS, enabling consistent low-latency performance and high availability. By establishing a direct connection, AWS Direct Connect allows for seamless communication between your AWS resources and your existing infrastructure, which can be critical for applications that require stable and fast connections.

AWS Direct Connect can facilitate remote server connections effectively when set up with the right configurations, such as those involving multiple ports that allow redundancy and higher resilience in the connectivity. This capability is especially important in enterprise environments where uptime and connectivity reliability are paramount for business operations.

Other options don't offer this specific capability. AWS VPN provides secure connections over the internet rather than a dedicated line, making it less optimal for high-availability scenarios compared to Direct Connect. Amazon S3 is a storage service and does not provide direct server connection functionalities. AWS CloudTrail is a logging service that tracks API calls for account management and compliance but does not facilitate remote server connections at all. Therefore, AWS Direct Connect is the service that best aligns with the criteria of ensuring high availability and supporting remote server connections.