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Dear Customer, Please advise if your EC2 is in a Private or Public Subnet? You will need to permit the traffic on the Security Group and Network ACL. You will also need to check the OS level firewall of your instance and the routing tables if it allows ping (ICMP) traffice to the Public Gateway
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Is the "physical gateway IP address" the public IP address of your home/office router? Do you want to allow access from that public IP address to the SQL Server? One reason you may not be able to ping it is because routers sometimes are configured not to respond to pings.