Win11 24H2 - DHCP issue - no Gateway

Question

Not 100% sure if our problem is only with Win 11 24H2, but with 23H2 the problem does not occur. It is occurring on several systems right now - both when upgrading on a notebook in a WSUS test group and when reinstalling via a USB stick. I do not have the problem on at least one notebook (also test group).

No network connection can be established on these now 5 different systems - neither via LAN nor WLAN. The error was quickly identified (the gateway is missing in the network configuration), but after rebooting the gateway is missing again. If it is added manually, everything works.

We use DHCP. Settings checked and ok. The configuration is complete, i.e. IP, mask, DNS servers are correct - only the gateway is missing. ipconfig /release or /renew do not help. Wireshark shows nothing conspicuous.

When reinstalling, the notebooks get stuck during installation at the point where a network connection is to be established (despite cable and/or correct WLAN settings). With an unattend.xml the installation goes through, but the gateway is missing.

Same problem in homelab after wiping the disk and reinstalling. I therefore rule out problems with the infrastructure.

***Moved from Windows / Windows 11 / Internet and connectivity***

Answer 1

We found solution for this.

https://support.microsoft.com/en-us/topic/november-12-2024-kb5046617-os-build-26100-2314-701f76d0-1127-43f5-a554-f562a940bc17#ID0EJBD=Catalog the files you find here: https://www.catalog.update.microsoft.com/Search.aspx?q=KB5046617

Install this files with:

Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5046617​​​​​​​-x64.msu"

This fixed DHCP problems.

Sadly when I tested this on one of our computers the issue still persists. I also tried applying a more recent update that supersedes to no avail. The DHCP information is missing when the request is performed.

Answer 2

We found solution for this.

https://support.microsoft.com/en-us/topic/november-12-2024-kb5046617-os-build-26100-2314-701f76d0-1127-43f5-a554-f562a940bc17#ID0EJBD=Catalog the files you find here: https://www.catalog.update.microsoft.com/Search.aspx?q=KB5046617

Install this files with:

Add-WindowsPackage -Online -PackagePath "c:\packages\Windows11.0-KB5046617​​​​​​​-x64.msu"

This fixed DHCP problems.

Sadly when I tested this on one of our computers the issue still persists. I also tried applying a more recent update that supersedes to no avail. The DHCP information is missing when the request is performed.

Issue still apparent with latest update. (26100.2605 - KB5048667). New discovery, if you use ipconfig /showclassid in a command prompt, it responds "There are no DHCPv4 classes defined for Ethernet." but on a 23H2 computer it lists all the user classes that are hosted on our DHCP server. I confirmed the class ID gets stored in registry on the 24H2 computer but it is not sent to the DHCP server and this command suggests it does not communicate with the server correctly either. The user classes are DHCP Option 77

Answer 3

Try this solution as well, if you still have a problem. At some stage in the past (due to a large HOSTS file) my DNS client service was set to disabled to stop long delays. Now in 24H2 this service is mandatory and must be running for DHCP to work (and file sharing). The upgrade left it disabled. It needs to be set via registry to working again.

The description on the service has this extra wording at the end "he DNS Client service (dnscache) sends Domain Name System (DNS) queries, caches query results, and registers the computer's full name on the network. This service is not stoppable.

This worked for me and I wish I had found it three months ago.

Answer 4

Sadly this service is already running for me. All of these 24H2 issues make me worried about how it will reflect in Windows Server 2025.