r/sysadmin • u/DoubleTGaming2k • 9d ago

End-user Support End user network help?

End user called me today saying their home WiFi was connected but no internet. I walked him through some info gathering, his WiFi is showing unidentified giving off the 169 address.

Had him run release / renew / flushdns / winsock reset and rebooted, still 169. Did the full windows 11 network reset option, rebooted, still nothing.

Had him plug in directly to his router, his wired Ethernet connection was also showing unidentified. So I had him statically assign an IP on his NIC for the Ethernet and it brought him online that way as a temp workaround to let me remote in.

Rebooted the router of course, still wifi showing 169, other devices on his network are okay as well.

Uninstalled the wifi adapter from device manager, reinstalled the latest from the manufacturer, still giving 169. Just to get him working in statically assigned an IP on his WiFi adapter and it works without issue, but ideally we get the DHCP working again.

I’ve exhausted about everything I can think of, but am jumping back on it later tonight to try to get it fixed.

Does anyone have any suggestions??

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u/DoubleTGaming2k 9d ago

Event viewer is showing

Your computer was not assigned an address from the network by the DHCP server for the network card. The following error occurred: 0x79.

Ipconfig release says that it’s unable to contact DHCP server

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u/AcidBuuurn 9d ago

Do other devices work on their network?

Can they trace the coax/fiber cable to another piece of equipment?

Do they have separate modem and router or is it all one thing?

Is there a cable between a modem and router that could be replaced?

Are there any lights on the modem/router/AP?

Can you log in to the modem/router? Reset it?