Welcome weary traveler.
If you’re like me your Samsung Smart HUB TV wired network stopped working for no sensible reason. Yet your router is working fine, and other devices on the router also work fine. Hmm.
I spent hours trawling the internet and could find no solution. I stumbled on a fix which was to..
1) Open network settings.
2) Click into IP settings.
3) Click set manually.
4) Then change a few settings around a bit.
5) Then click set automatically.
6) Do steps 3 5 one more time.
This forces the system to ask the router to re-provision a DHCP network ip address, and I believe this fixes the issue.
This also stops the need to reset to factory settings (which BTW doesn’t change network settings anyway!)
My model is UN40ES6500F but I think any UN* will have similar issues.