Network "media disconnected" on Windows 10 guest

[itm]

I'm running a Windows 10 guest on a Windows 10 host. The guest was working fine the last time I started it up, but now the network connection is broken - it shows "Media disconnected". I have the network adapter attached to NAT in the guest settings.
This is the output from ipconfig/all in the guest:

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ipconfig/all

Windows IP Configuration

   Host Name . . . . . . . . . . . . : DESKTOP-MST5ND5
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No

Unknown adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Private Internet Access Network Adapter
   Physical Address. . . . . . . . . : 00-FF-F3-A3-68-D9
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

This is the output from VBoxManage showinfo for the guest:

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Name:                        Windows 10 Guest
Groups:                      /
Guest OS:                    Windows 7 (64-bit)
UUID:                        6b645cf1-b62f-4318-9db4-70ee43320221
Config file:                 D:\VirtualBox VMs\Windows 10 Guest\Windows 10 Guest.vbox
Snapshot folder:             D:\VirtualBox VMs\Windows 10 Guest\Snapshots
Log folder:                  D:\VirtualBox VMs\Windows 10 Guest\Logs
Hardware UUID:               6b645cf1-b62f-4318-9db4-70ee43320221
Memory size                  8192MB
Page Fusion:                 disabled
VRAM size:                   128MB
CPU exec cap:                100%
HPET:                        disabled
CPUProfile:                  host
Chipset:                     piix3
Firmware:                    BIOS
Number of CPUs:              2
PAE:                         disabled
Long Mode:                   enabled
Triple Fault Reset:          disabled
APIC:                        enabled
X2APIC:                      disabled
Nested VT-x/AMD-V:           disabled
CPUID Portability Level:     0
CPUID overrides:             None
Boot menu mode:              message and menu
Boot Device 1:               Floppy
Boot Device 2:               DVD
Boot Device 3:               HardDisk
Boot Device 4:               Not Assigned
ACPI:                        enabled
IOAPIC:                      enabled
BIOS APIC mode:              APIC
Time offset:                 0ms
RTC:                         local time
Hardware Virtualization:     enabled
Nested Paging:               enabled
Large Pages:                 enabled
VT-x VPID:                   enabled
VT-x Unrestricted Exec.:     enabled
Paravirt. Provider:          Default
Effective Paravirt. Prov.:   HyperV
State:                       running (since 2020-10-24T14:41:59.202000000)
Graphics Controller:         VBoxVGA
Monitor count:               1
3D Acceleration:             disabled
2D Video Acceleration:       disabled
Teleporter Enabled:          disabled
Teleporter Port:             0
Teleporter Address:          
Teleporter Password:         
Tracing Enabled:             disabled
Allow Tracing to Access VM:  disabled
Tracing Configuration:       
Autostart Enabled:           disabled
Autostart Delay:             0
Default Frontend:            
VM process priority:         default
Storage Controller Name (0):            SATA
Storage Controller Type (0):            IntelAhci
Storage Controller Instance Number (0): 0
Storage Controller Max Port Count (0):  30
Storage Controller Port Count (0):      2
Storage Controller Bootable (0):        on
SATA (0, 0): D:\VirtualBox VMs\Windows 10 Guest\Windows 10 Guest.vdi (UUID: aedf1e0c-5667-45ba-b50b-59abe3da16f3)
SATA (1, 0): C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso (UUID: 9856ec9c-c4ac-4d8c-a42c-2c072dcc6923)
NIC 1:                       MAC: 0800276CA9F2, Attachment: NAT, Cable connected: on, Trace: off (file: none), Type: Am79C970A, Reported speed: 0 Mbps, Boot priority: 0, Promisc Policy: deny, Bandwidth group: none
NIC 1 Settings:  MTU: 0, Socket (send: 64, receive: 64), TCP Window (send:64, receive: 64)
NIC 2:                       disabled
NIC 3:                       disabled
NIC 4:                       disabled
NIC 5:                       disabled
NIC 6:                       disabled
NIC 7:                       disabled
NIC 8:                       disabled
Pointing Device:             PS/2 Mouse
Keyboard Device:             PS/2 Keyboard
UART 1:                      I/O base: 0x03f8, IRQ: 4, disconnected, 16550A
UART 2:                      I/O base: 0x02f8, IRQ: 3, disconnected, 16550A
UART 3:                      I/O base: 0x03e8, IRQ: 4, disconnected, 16550A
UART 4:                      I/O base: 0x02e8, IRQ: 3, disconnected, 16550A
LPT 1:                       disabled
LPT 2:                       disabled
Audio:                       enabled (Driver: DSOUND, Controller: HDA, Codec: STAC9221)
Audio playback:              enabled
Audio capture:               disabled
Clipboard Mode:              disabled
Drag and drop Mode:          disabled
Session name:                GUI/Qt
Video mode:                  1152x864x32 at 0,0 enabled
VRDE:                        disabled
OHCI USB:                    disabled
EHCI USB:                    disabled
xHCI USB:                    enabled

USB Device Filters:

<none>

Available remote USB devices:

<none>

Currently Attached USB Devices:

<none>

Bandwidth groups:  <none>

Shared folders:

Name: 'D_DRIVE', Host path: 'D:\' (machine mapping), writable, mount-point: 'D'
Name: 'J_DRIVE', Host path: 'J:\' (machine mapping), writable, mount-point: 'J'
Name: 'Videos', Host path: 'J:\Videos' (machine mapping), writable, auto-mount, mount-point: 'H:'

VRDE Connection:             not active
Clients so far:              0

Capturing:                   active
Capture audio:               not active
Capture screens:             0
Capture file:                D:\VirtualBox VMs\Windows 10 Guest\Windows 10 Guest.webm
Capture dimensions:          1024x768
Capture rate:                512kbps
Capture FPS:                 25kbps
Capture options:             vc_enabled=true,ac_enabled=false,ac_profile=med

Guest:

Configured memory balloon size: 0MB
OS type:                     Windows10_64
Additions run level:         3
Additions version:           6.1.14 r140239

Guest Facilities:

Facility "VirtualBox Base Driver": active/running (last update: 2020/10/24 14:42:08 UTC)
Facility "VirtualBox System Service": active/running (last update: 2020/10/24 14:42:40 UTC)
Facility "VirtualBox Desktop Integration": active/running (last update: 2020/10/24 14:45:42 UTC)
Facility "Seamless Mode": active/running (last update: 2020/10/24 14:45:42 UTC)
Facility "Graphics Mode": active/running (last update: 2020/10/24 14:45:42 UTC)

Any idea what the problem is?

[scottgus1]

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NIC 1:  .... Type: Am79C970A

The New Guest Wizard defaults to giving Windows 10 guests an Intel PRO/1000 MT Desktop 82540EM network adapter. You're using the PCnet-PCI II Am79C970A adapter. Does Windows 10 have drivers for this really old adapter?

See your guest's Network settings, first adapter, Advanced dropdown, Adapter type.

[itm]

Code: Select all

NIC 1:  .... Type: Am79C970A

The New Guest Wizard defaults to giving Windows 10 guests an Intel PRO/1000 MT Desktop 82540EM network adapter. You're using the PCnet-PCI II Am79C970A adapter. Does Windows 10 have drivers for this really old adapter?

See your guest's Network settings, first adapter, Advanced dropdown, Adapter type.

Many thanks - I changed the network adapter to Intel PRO/1000 MT Desktop 82540EM and it resolved the problem.

[scottgus1]

Great! Glad you're up and running.