DHCP not send for win7 clients

Hi all,
I have problem with DHCP in win7. I have settup DHCP server and all working fine. But yesterday all clients DHCP with os win7 not receive any DHCP configs.
i was not make any changes in setting.

please help solve this issues.

Thanks so much for your help!

Reboot the router. If problem persists, use Tools > Packet Sniffer to see if Win 7 client DHCP requests are making it to router, and if the router is replying.

Also check windows event log for things like IP conflict.

I might add that you should look at Wireshark on your Windows 7 machine, using the display filter “bootp” and see if you can see an offer coming back for your mac address. If so, it’s a client issue probably.

If it was working and suddenly only Windows 7 stopped working, this seems more like some firewall policy push gone wrong or something.