A security engineer is troubleshooting a single web server that is not receiving any internet traffic. Other web servers are working normally. The environment uses network ACLs, security groups, a virtual security appliance, and Application Load Balancers (ALBs) for load distribution. All internet-bound traffic must pass through the virtual security appliance. The engineer has verified that the security group rules, network ACL rules, and virtual appliance rules are correct. Which additional items are valid to check? (Choose two.)

The problem states that other web servers are working normally, implying the issue is specific to this one server, not a widespread network or ALB configuration. Verifying the security group attached to the specific web server's ENI is crucial because even if the rules are correct, the attachment to this particular server might be wrong or missing, preventing traffic. Verifying the ALB's registered targets is also critical. If the problematic web server is not registered as a target, or if its health checks are failing, the ALB will not forward traffic to it, even if the server itself is operational and its security configurations are correct. The route table options are less likely to be the primary cause. If the 0.0.0.0/0 route was incorrect in the web server's subnet, it would likely affect all servers in that subnet, not just one. Similarly, a NAT gateway route is for outbound internet access, not inbound traffic to a web server. The problem states all internet-bound traffic must pass through the virtual security appliance, so the 0.0.0.0/0 route in the web server subnet should point to the virtual security appliance for outbound traffic, but this doesn't directly explain why inbound traffic isn't reaching a single server.