I suspect that you're experiencing one of many simple networking problems. It could be that the switch/router port that your firewall is connected to is incorrectly configured. Perhaps the network interface in the firewall is defective. Are you certain that you've applied an appropriate IP address to the firewall's interface?
My recommendation is to approach this problem in the same manner as you'd handle any device that you're not able to connect to your network. Check the simple things first (link lights, IP configuration, etc.) and then expand outward to more advanced techniques, such as sniffing the network segment using a tool like Wireshark.
Dig deeper on Network Firewalls, Routers and Switches
Related Q&A from Mike Chapple, Enterprise Compliance
The HHS security risk assessment tool is designed to help healthcare providers meet the HIPAA security requirement. Expert Mike Chapple explains how ...continue reading
PCI DSS requirement 6.6 demands application security compliance through one of two options: an application firewall or a code review. Expert Mike ...continue reading
Are HIPAA-compliant hosting services a better option for compliance than a secure storage API? Expert Mike Chapple analyzes.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.