You are running a vulnerability scan on a remote network and the traffic is not making it to the target system. You investigate the connection issue and determine that the traffic is making it to the internal interface of your network firewall, but not making it to the external interface or to any systems outside your firewall. What is the most likely problem?
1) A host based firewall is blocking the traffic
2) Your ISP is blocking the traffic
3) The remote site you are testing is blocking the traffic
4) Your network firewall is blocking the traffic