Because of how they designed their software, if Samsung services are on the blink or down this can happen. I've yet to find Samsung putting up a status page so we're left with calling their support lines.
I have a Samsung smart TV (40 inch) unsure of the model number as i am at work. It has a wired connection to my BT Infinity router, up until this morning it was working fine when accessing the smart hub, Netflix etc. This morning when accessing smart hub the TV said that it could not connect to the internet, I ran a test, TV said cable to router fine, but no internet. WIFI on all other devices is working ok. I have reset the router, disconnected tv from the mains, swapped the ASDL filter for a new one and changed all cabling (wall-router/router-tv). The TV is still giving me the same error message. I'm unsure of the next step, any help would be appreciated.