[Monitoring, Reporting, and Automation] A company has an AWS Site-to-Site VPN connection between on-premises resources and resources that are hosted…

[Monitoring, Reporting, and Automation] A company has an AWS Site-to-Site VPN connection between on-premises resources and resources that are hosted in a VPC. A SysOps administrator launches an Amazon EC2 instance that has only a private IP address into a private subnet in the VPC. The EC2 instance runs Microsoft Windows Server. A security group for the EC2 instance has rules that allow inbound traffic from the on-premises network over the VPN connection. The on-premises environment contains a third-party network firewall. Rules in the third-party network firewall allow Remote Desktop Protocol (RDP) traffic to flow between the on-premises users over the VPN connection. The on-premises users are unable to connect to the EC2 instance and receive a timeout error. What should the SysOps administrator do to troubleshoot this issue?