I have the same problem as described above with my BDP BX57. I can connect to the wireless router, but it says that the gateway is not responding. Funny thing is, that I can get all of the streaming services without a problem. I even get notices displayed on the box from Sony that I need a firmware update. Therefore, it is connecting to the internet just fine. Also standing next to the box, I can get to the internet through my wireless router with my laptop and cell phone.
But when you look at the network status, it says that there is a wireless connection but no internet connection. The Sony Diagnostics say that the gateway is not responding, but I know the gateway is fine, I have three other computers and two cell phones that are going through that gateway without any problems. I checked all of the IP addresses and they are what they should be. Why are they looking for a response from the gateway anyway? Shouldnt they just be passively going through the gateway? Are they trying to do something stupid with my gateway as part of their DRM?
When you try to get a firmware update, it says that there is no internet access so it will not update. I finally downloaded the latest firmware update and put it on a disk and updated the box manually, but it didnt change anything.
I finally hardwired the box to my wired main firewall router to bypass any potential wireless problems, but it didnt fix anything, I still get the same problem. I have 20 Mbps internet connection, so I know that it is not a bandwidth problem. I also checked that cable going to the Sony by connecting it to my laptop and it connected to the internet just fine.
I think that the problem is a software glitch in Sonys communication program. Sony customer service claim that that would be impossible, and thats what convinced me that it was true. All the streaming services connect and play just fine, except Netflix, which keeps loosing connection because Sony is rerouting all Netflix through their overloaded servers, but that is a different known problem with Sony.
If you can ignore that fact that it is only the Sony update service, status screen, and diagnostics that can't connect to the internet (everything non-Sony connects just fine) the machine isnt all that bad.