http://blogs.msdn.com/b/jesse_collins/archive/2010/10/12/why-can-t-i-make-socket-connections-to-port-80-with-silverlight.aspxAaron Oneal on Silverlight's restricted port ranges for sockets. http://blogs.msdn.com/b/ncl/archive/2009/06/23/why-does-silverlight-have-a-restricted-port-range-for-sockets.aspx Note that a Silverlight trusted app is allowed to make connectionsen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)