The Linksys port forwarding not working in your case can be due to a range of common reasons. First, the device you want to open ports for should have a static IP address-the dynamic ones might change and invalidate your rule. Make sure the correct port numbers, IP address, and protocol (TCP/UDP) are entered. In addition, disable all firewalls and security applications that might block communication. Finally, see whether your router is behind another router (double NAT), a circumstance that can interfere with port forwarding, and make sure your firmware is current. Solving these should put to rest almost every Linksys port forwarding problem.