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GhislainPlante-9427 avatar image
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GhislainPlante-9427 asked ·

How to correct an unidentified network problem after installing Windows 10 1909?

After installing Windows 10 update 1909 I no longer have internet access.

With troubleshoot I have: device is connected but cannot access the network.

With the problem solving I have: Ethernet does not have a valid ip configuration. I checked the configuration for Ipv4 and it is good.

In network and sharing center I have: Unidentified network / public network, Access: Ethernet (no network access).

I deactivated the network card and after I activated it and restart my computer, the problem persists.

On the router the port where my computer is connected the light flashes and on my computer the connection flashes.

The network card:

Intel (R) 8279V Gigabit
Manufacturer: Intel Corporation
Driver version: 12.17.10.8.

How to correct this problem?

Can I uninstall update 1909 to correct this problem?

I'm in despair, I need a job name and internet access !!!!!!!!

Excuse my English is a Google translation.

Ghislain Plante

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Sean-Liming avatar image
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Sean-Liming answered ·

Interesting the IP provider did a reboot on their end with nothing attached and it worked. Have to make a note of that trick.

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Network devices retain MAC address information and a problem can occur if you change what is connected to the device without rebooting it. It is a normal process (for example) with a cable modem, to disconnect its network port, reboot it and then reconnect. Having no device connected on power up will clear the remembered MAC address, connecting the cable again with make it remember the new one. This wouldn't be required for an OS upgrade, unless the client's MAC Address changed, or the data was corrupted in the device memory.

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DSPatrick avatar image
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DSPatrick answered ·

On the right side of the taskbar, select the network icon, then under the name of the network that you’re connected to, select Properties, then under Network profile, select Public or Private.






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Sean-Liming avatar image
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Sean-Liming answered ·

Try rebooting the router. Sometimes the router gets hung up.
If you are using DHCP, open a command window and do the following:

ipconfig /release
ipconfig /renew

If you have another computer that is working, plug it into the port being used by the problematic computer and see if the connection is working.

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GhislainPlante-9427 avatar image
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GhislainPlante-9427 answered ·

Hi!

I restart the router.

At the command: ipconfig / release, I had:

Error releasing the Ethernet interface, no IP address.

At the ipconfig / renew command, I had
unable to contact the DHCP server, in the properties of the interface I had for IPV4: automatically obtain the DNS address.

I have changed the IPV4 property to use the following DNS server address (that of the router).

The renew does not work, same error message.

In the Windows event log there is the message:

The network does not assign any IP address to your computer, error 0x79.

In device manager for the network card we have: device is working properly.


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Sounding more like the router is problematic


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Tripredacus-7848 avatar image
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Tripredacus-7848 answered ·

Need a network map or description. If the computer connected to a router with 1 network cable or is it more complicated than that?
Do other computers work on the router?
I would set a static IP to one on the subnet of the DHCP scope (the router manual would say what that is) and then see if I can log into the router and look at its DHCP logs.

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GhislainPlante-9427 avatar image
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GhislainPlante-9427 answered ·

513/5000
I contacted my internet provider because they are the ones who provide me with the router.

They asked me to disconnect the RJ45 cable from the router. They restarted the router and told me to wait 5 minutes before reconnecting the rj45.

After this time I reconnected the cable rj45 and it works, I have access to the internet.

Quite a coincidence that the router fell into trouble after updating Windows 1909.


Problem solved.

Thank you very much for the time you took to help me !!!!!!!!

Ghislain Plante

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DSPatrick avatar image
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DSPatrick answered ·

Sounds good, you're welcome.

(please don't forget to mark helpful replies as answer)


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Joyqiao-3755 avatar image
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Joyqiao-3755 answered ·

Hi,

Thank you for posting in Microsoft Q&A.
According to your description, your issue seems more related with Network. As the Network topic have not moved to Microsoft Q&A yet, please kindly re-post your issue to forum TechNet.

Note that TechNet is retiring soon, and all supported forums would be moved to Microsoft Q&A later in April or May. Please watch out for our future announcements.

Looking forward to read your new post then in Microsoft Q&A!

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