I set up a post with a lot of tips over in the CNET Networking Forum for Samsung Owners. As I have no details here I can only ask that you review the post and see if anything helps. Link follows.
My Samsung TV UN55c8000xfx2a using a Samsung USB wireless lna adapter model wis09abgnx/xaa which identifies and connects wirelessly to my Linksys Router model EA2700 using Comcast cable's signal and my PC's Home Network using Win 7. Connection is usually with 3 bars.
The message I get is "Connection established but not working. Check TV or connection devices network settings"
No matter what I do, I cannot establish a workingSmart TV Internet operation.