Wifi - failed to obtain ip address

[nrsamsung]

Dear all,

I have been using my S7 for a year. At home I always connect to my home Wifi. Suddenly since last week I cannot connect to my home network anymore.

The phone says "failed to obtain ip address". However I can see my DHCP server just tries to hand out the same IP address it always assigned to my phone:

Sep 18 11:19:22 xx dhcpd[27657]: DHCPDISCOVER from xx:xx:xx:xx:xx:xx (S7) via eno2
Sep 18 11:19:22 xx dhcpd[27657]: DHCPOFFER on 192.168.1.201 to xx:xx:xx:xx:xx:xx (S7) via eno2

I have tried to assign a static IP but then I get a message saying Internet may not be available.

The phone connects fine to other Wifi networks and other phones connect fine to my home network.

Bit stumped on this one.

Any help getting this fixed appreciated.

[Rohit]

You tried forgetting your network, and then reconnect again?

[nrsamsung]

Yes, sorry forgot to add. I restarted my DHCP server, rebooted the phone, forget and re-add the Wifi network. Same error message after every step. Its really strange it happened all of a sudden last week and now nothing I can do to make it connect to my home network.

[BruceH]

Hi @nrsamsung,

can you try resetting your router and changing the channel the router uses? You can use an Wifi analyzer to see which channel is best for you. 

[nrsamsung]

Hi Bruce, thanks for the suggestion.

Yes I tried that already. I  tried creating a new network on my router. The router (a bunch of Airport Extreme routers scattered throughout the house) has an option to create a separate 5 GHZ network with a new name. So I tried that, but I get exactly the same error on the new network as well.

I then created a guest network using that feature on the Airport Extreme with a new different name and new different password, but again exactly the same error (I think in this case the Airport Extreme is the DHCP server as I don't get anything in my logs).

[Rohit]

Then it's time to backup and reset!

Backup en reset:
http://www.samsung.com/uk/support/skp/faq/1109470