Check the following:

• Check that the device is correctly powered up (status LED is green) and plugged into the network (network LED is green).
• If the status LED is showing a problem perform a power cycle, and if there is still a problem restore the factory settings.
• Make sure the device is listed as online and installed in Boost.LAN Manager.
  (If not see the FAQ: I can’t find my ES device in Boost.LAN Manager)
• Make sure that the port you are trying to open is not being blocked by a firewall or anti-virus that may be installed. (see Firewall FAQ)