Forum Discussion
Azure VM Losing Network Connectivity after Doomain Removal
I currently have Azure VM domain joined servers running Server 2019 Std which are being upgraded via an in-place upgrade to Server 2025 Std. After the upgrade I will be un-joining from the domain an...
Seems related to DNS and routing dependencies tied to the Domain join being broken. Once you unjoin from the Domain, the VM defaults to Azure DNS and “Public” network profile, which combined with your forced Azure Firewall route (0.0.0.0/0 → Virtual Appliance) can block traffic if DNS or NSG rules aren’t correctly aligned. Please try to fix this by re-validating DNS, NSG, and route table settings for Entra‑joined VMs.
https://learn.microsoft.com/en-us/entra/identity/domain-services/troubleshoot-domain-join