fix hyper-v vms suddenly have no network

Question

3 running Windows Server 2019 VMs running on WinSrv 2019 VMHOST - been running fine for many months.

Saturday night 1030pm we got a warning that one of the servers (RDS) was offline. Next morning we remoted on, found it was apparently running, just not visible on network, so we restarted it, tested and all working fine. Next morning (today) staff arrived at work at 7am and no-one could access the RDS.

Been troubleshooting ALL DAY and we have confirmed that the issue lies on the Hyper-V switch - we have deleted and recreated hyper-v switch, removed hyper-v role and recreated. Any ideas please!

Answer 1

Hi Sarah,

Hope you're doing well.

1. Ensure that there are no issues with the physical network connections to the Hyper-V host. Verify that the network cables are securely connected and that there are no hardware issues with the network adapters.
2. Make sure that the network adapter drivers on the Hyper-V host are up to date. Sometimes outdated or incompatible drivers can cause issues with network connectivity.
3. Double-check the configuration of the Hyper-V virtual switch. Verify that it is configured correctly and that it is connected to the correct physical network adapter(s). Pay attention to any VLAN settings or other advanced configurations that may be affecting network traffic.
4. If VLANs are being used in your network environment, ensure that the VLAN settings on the Hyper-V virtual switch match the VLAN settings on the physical network infrastructure.
5. Check the event logs on the Hyper-V host and the affected VMs for any relevant error messages or warnings that could provide insight into the cause of the network connectivity issue.

Best Regards,

Ian Xue

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