Microsoft Virtual Adapter disable automatically after reboot. Hyper-V, Windows server 2019

Retheesh Reghuvaran 101 Reputation points
2021-04-14T05:47:17.037+00:00

Hello Team,

I have two Dell PowerEdge R740 Servers installed with Windows server 2019 Std (Version 1809 (OS build 17760.379). Have created Hyper-V role on it and configured a virtual switch as well. After restart the server, i found that the Microsoft Virtual Adapter disabled.

I tried to enable it in network connections page, it was not enabling.

Then I open the device manager and disabled then enabled the Hyper-V virtual ethernet adaper, then starts working.

whenever I restart the server, its disabling automatically.

Regards

Retheesh.

Windows Server 2019
Windows Server 2019
A Microsoft server operating system that supports enterprise-level management updated to data storage.
3,472 questions
Hyper-V
Hyper-V
A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
2,550 questions
Accepted answer
  1. Retheesh Reghuvaran 101 Reputation points
    2021-05-12T06:53:25.557+00:00

    At last i found out the problem. Our security software Sentinel One was disabling the Hyper-V Virtual Switch.
    Uninstalled Sentinel One and the server is functioning properly now.

    Thanks for all your comments and help.

    1 person found this answer helpful.
    0 comments

3 additional answers

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  1. Reza-Ameri 16,836 Reputation points
    2021-04-14T14:29:11.8+00:00

    Try update Windows and the network driver.
    Check event viewer and see if there is any error or warning related to this issue?

    0 comments
  2. Dave Patrick 426.1K Reputation points MVP
    2021-04-14T16:10:48.69+00:00

    I'd check that windows has been patched fully. Also check the latest firmware, ROM bios, chipset, and driver supports packs have been installed.

    Also try deleting / recreating the vSwitch. When you create a new external vSwitch the internet protocols are removed from the adapter and the Hyper-V Extensible Switch protocol is added turning that physical port into a multi-port virtual switch. Connect your VMs to this switch

    --please don't forget to Accept as answer if the reply is helpful--

  3. Dave Patrick 426.1K Reputation points MVP
    2021-04-23T12:54:37.363+00:00

    Should have worked out of the box. Make sure that you do not edit the vSwitch or vEthernet properties after creation.
    https://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/get-started/create-a-virtual-switch-for-hyper-v-virtual-machines

    --please don't forget to Accept as answer if the reply is helpful--