I was having the same problem on my Samsung BluRay player. Ultimately I fixed it by changing my router name (no spaces, no characters, no lower case); moving to WEP 64-bit encryption rather than 128; and then resetting the player. I have no idea if that will fix your problem, but good luck.
I bought a new UE40B7000 LED TV. It is impossible to connect it through ethernet (linksys WAG354G). In the auto settings of the tv, I get the message that the IP, Subnet, etc. cannot be found and if I put the settings manually I always get a gateway ping failure. I tried everything, even to stop the firewall (as some people wrote in the forum). I even tried another router with the same problems. If I try to connect my laptop there is no problem, so my network and cables should work perfectly. Is there a setting I must use or should return it to the service ?
Any help would be appreciated