Forward Proxy Deployment
PCAP from the Proxy reveals the ProxySG is receiving the client traffic but is not replying to the SYN

PCAP > Packet capture

1. Confirm the Service is enabled to listen for the traffic on the required port.
2. Confirm the traffic is coming to the correct interface
3. Confirm reject-inbound is disabled: https://support.symantec.com/en_US/article.TECH241714.html
4. Ensure client has not triggered attack detection: https://support.symantec.com/en_US/article.TECH241365.html