Control Ip Relay Device From Internet

i wrote some code to control an ip device, i made in windows forms application , silverlight and asp.net, they all work on the local network , but won't work from internet web server, i have the router forwarding to local device ip and port,

i get this error:

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 226.45.306.158:4999

here's the code used

Private Function SendRelayCommandTest(ByVal e As String) As String
'SendTextToIP("setstate,1:" & thePort & "," & TheState)
'Dim IPHostCC1 As String = "192.168.1.105"

[Code]....