I have 2 of the same kind of routers, one at work and other at home. One of them doesn't allow the S4 to obtain IP address whereas the other one has no issues. The tricky part is that all the 4 S4(s) have the same issue. I swapped the routers and they still don't work with bad one. I have also contacted Trendnet support and they are trying to show me all kids stuff. I'm software programmer and hardware literate. The S4(s) work at so many other routers and hotspots without any issues, only this particular router. It's brother works without a glitch. Any insight would be helpful.