Unit has been working for years. Suddenly, when trying to connect, get message " Wi-Fi doesn't have a valid IP Configuration". Therefore, cannot connect to either of the 4 ports or thru Wi-Fi. Power light is on as well as 2.4GHz and 5 GHz and WPS. Internet and Ethernet port (1-4) lights are off. Available networks do show up on pc as NetGear91 and NetGear91-5G. If try to us WPS to connect, get message “Can’t connect to this network”. I connected an old Linksys router and it worked, therefore, connection from Xfinity modem to WAN on NetGear router is good. I believe the NetGear router is bad. Any suggestions?

1. what router do you have? you didn't put a model anywhere I could find2. what firmware is on it? 3. What modem/gateway is it connected to?

I thought I had everything in the message. Netgear AC1750 Smart WiF Router, 02.11 ac dual Bank Gigabit, Model No: R6400v2, (R6400-100NAS), firmware V1.0.4.78. Cannot get internet connection to try to update firmware. Tried to use NightHawk app on android phone and routerlogin.net.genie but since no internet connection, this failed. It is connected to Xfinity modem XB6-T. Tested with an old Linksys router so I know there is not a problem with the modem connection to the router. Reason I switched to the NetGear AC1750 was to get more WiFi range.

that xfinity modem is a router as well. It puts you in a double nat. Some handle it better than others. https://kb.netgear.com/30186/What-is-Double-NAThave you disabled the routing functions on the xfinity? or put the netgear in access point mode?

I have done nothing to the xfiniity (modem/router) It has worked perfectly for 2 years. I believe the router just might be bad.I cannot access or update the software on the NetGear router because I have no wifi on the unit. Old routers will work.

did you try restarting the netgear router? you can also try resetting the router back to defaults again by pushing the reset button for 30 seconds. Did you try any of those?

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13 Replies

plemans
Guru - Experienced User
Nov 11, 2020
1. what router do you have? you didn't put a model anywhere I could find
2. what firmware is on it?
3. What modem/gateway is it connected to?
- J_Jefferson
  Aspirant
  Nov 12, 2020
  I thought I had everything in the message. Netgear AC1750 Smart WiF Router, 02.11 ac dual Bank Gigabit, Model No: R6400v2, (R6400-100NAS), firmware V1.0.4.78. Cannot get internet connection to try to update firmware. Tried to use NightHawk app on android phone and routerlogin.net.genie but since no internet connection, this failed.
  
  It is connected to Xfinity modem XB6-T. Tested with an old Linksys router so I know there is not a problem with the modem connection to the router. Reason I switched to the NetGear AC1750 was to get more WiFi range.
  - plemans
    Guru - Experienced User
    Nov 12, 2020
    that xfinity modem is a router as well. It puts you in a double nat. Some handle it better than others.
    https://kb.netgear.com/30186/What-is-Double-NAT
    have you disabled the routing functions on the xfinity?
    or put the netgear in access point mode?

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