Nat networking in Virtual Box for Windows 7 host and Ubuntu 16.04 guest not working all of a sudden

[dk1301]

I had installed virtualbox on Windows 7 host. Additionally I installed an Ubuntu 16.04 32 bit VM guest. For the network adapter I chose attach to Nat Network.
I have been using this configuration both behind a corporate proxy and on a home adsl router and both worked fine. Up to last week I had internet connection via the VM.
Unfortunately when I checked today I couldn't connect to the internet any more. When I ping the google DNS server 8.8.8.8 I also got Destination Host Unreachable.
I updated the Virtualbox and to its latest version 5.1.18r114002 but no success. I also added Google Dns servers 8.8.8.8 and 8.8.4.4 either on host or no guest but the internet
access could not be retrieved.
Has anyone any idea why this may have happened?

[Mondraker]

Hi,

I unfortunatly face the same issue since the 14th of march. After a reboot no way to access network from a Ubuntu 14.4 without any change on the host or the guest network setting.
There was a windows update on this day but after a restauration of the system before this update the issue persist.

Guest: Ubuntu 14.4 64 bits
Host: Windows 7
Virtualbox: 5.1.10

[socratis]

@dk1301
I have no clue since you didn't attach any logs. But the answer may be the same as the one below.

@Mondraker
Your Lavasoft certificate has expired and the software cannot load. Either uninstall the Lavasoft software or update it.

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00:07:22.820726 supR3HardenedErrorV: supR3HardenedScreenImage/LdrLoadDll: rc=VERR_LDRVI_UNSUPPORTED_ARCH fImage=1 fProtect=0x0 fAccess=0x0 \Device\HarddiskVolume1\Windows\System32\LavasoftTcpService64.dll: WinVerifyTrust failed with hrc=CERT_E_EXPIRED on '\Device\HarddiskVolume1\Windows\System32\LavasoftTcpService64.dll'

00:07:22.821155 supR3HardenedErrorV: supR3HardenedMonitor_LdrLoadDll: rejecting 'C:\Windows\system32\LavasoftTcpService64.dll' (C:\Windows\system32\LavasoftTcpService64.dll): rcNt=0xc0000190

Edit: I deleted your duplicate post from viewtopic.php?f=6&t=82273. Duplicates are not allowed.

[dk1301]

Sorry @socratis I didn't know I had to provide log. Sorry for the inconvenience, I have enclosed it.

Guest: Ubuntu 16.04 amd64
Host: Windows 7
Virtualbox :5.1.18r114002

[socratis]

I should have been more specific. The "VBoxSVC.log" is not an appropriate one in this case. Start the VM. When it fails, right-click on the VM in the VirtualBox Manager, "Show Log". Then either the "VBoxHardening.log" of the first "VBox.log".

Actually zip them both together and attach that zip file.

PS. Read my signature...

[Mondraker]

Hi Socratis,

Sorry for the duplicate. And actually the issue was the same than the one of the post you mentionned above. So indeed unsinstalling the Web companion fixed the bug.

Thank you for the support

[dk1301]

Hi @socratis again. I enclosed the files you asked.

[socratis]

Hey dk1301,
I took a look at your logs. I can't see anything glaring. Could you please post the output of the following commands from a Command Prompt in your Win host? The first one is just to get you to the "VBoxManage" directory:

• cd "C:\Program Files\Oracle\VirtualBox"      <-- change it if not the default installation
  VBoxManage list natnets
  VBoxManage list dhcpservers

and from your Ubuntu guest the output of:

• ifconfig -a

[dk1301]

Hi again, I have enclosed the command printouts

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C:\Program Files\Oracle\VirtualBox>VBoxManage list natnets
NetworkName:    NatNetwork
IP:             10.0.2.1
Network:        10.0.2.0/24
IPv6 Enabled:   No
IPv6 Prefix:    fd17:625c:f037:2::/64
DHCP Enabled:   Yes
Enabled:        Yes
loopback mappings (ipv4)
        127.0.0.1=2

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C:\Program Files\Oracle\VirtualBox>VBoxManage list dhcpservers
NetworkName:    HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter
IP:             192.168.56.100
NetworkMask:    255.255.255.0
lowerIPAddress: 192.168.56.101
upperIPAddress: 192.168.56.254
Enabled:        Yes

NetworkName:    NatNetwork
IP:             10.0.2.3
NetworkMask:    255.255.255.0
lowerIPAddress: 10.0.2.4
upperIPAddress: 10.0.2.254
Enabled:        Yes

NetworkName:    NatNetwork1
IP:             10.0.2.3
NetworkMask:    255.255.255.0
lowerIPAddress: 10.0.2.4
upperIPAddress: 10.0.2.254
Enabled:        Yes

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npt@npt-VirtualBox:~$ ifconfig -a
enp0s3    Link encap:Ethernet  HWaddr 08:00:27:03:68:77  
          inet addr:10.0.2.29  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::2ba2:c005:5862:fbff/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1 errors:0 dropped:0 overruns:0 frame:0
          TX packets:194 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:590 (590.0 B)  TX bytes:15181 (15.1 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:505 errors:0 dropped:0 overruns:0 frame:0
          TX packets:505 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:45249 (45.2 KB)  TX bytes:45249 (45.2 KB)

[socratis]

Problem #1: you chose your NATService to have the same range as the built-in NAT, 10.0.2.x. Did you have any particular reason for that, or was it by accident? In any event, try to change the range to something non-conflicting, like 10.35.97.x.

Problem #2: you have two identical DHCP servers. I really don't know how it affects things, but "I've got a bad feeling about this".

I suggest to delete the NatNetwork, and then cleanup the DHCP servers situation. Then re-create the NatNetwork with a suggested IP range as above. Repeat the commands and make sure that everything is in order. See how it goes...

[dk1301]

Hi again I delete all previous nat networks and created a new with the proposed IP range but the problem persisted.
I enclosed the new command printout.

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C:\Program Files\Oracle\VirtualBox>VBoxManage list natnets
NetworkName:    MyNetwork
IP:             10.35.97.1
Network:        10.35.97.0/24
IPv6 Enabled:   No
IPv6 Prefix:    fd17:625c:f037:2::/64
DHCP Enabled:   Yes
Enabled:        Yes
loopback mappings (ipv4)
        127.0.0.1=2

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C:\Program Files\Oracle\VirtualBox>VBoxManage list dhcpservers
NetworkName:    HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter
IP:             192.168.56.100
NetworkMask:    255.255.255.0
lowerIPAddress: 192.168.56.101
upperIPAddress: 192.168.56.254
Enabled:        Yes

NetworkName:    MyNetwork
IP:             10.35.97.3
NetworkMask:    255.255.255.0
lowerIPAddress: 10.35.97.4
upperIPAddress: 10.35.97.254
Enabled:        Yes

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npt@npt-VirtualBox:~$ ifconfig
enp0s3    Link encap:Ethernet  HWaddr 08:00:27:d4:39:13  
          inet addr:10.35.97.5  Bcast:10.35.97.255  Mask:255.255.255.0
          inet6 addr: fe80::442f:1ba0:cea7:8fb7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2 errors:0 dropped:0 overruns:0 frame:0
          TX packets:105 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1180 (1.1 KB)  TX bytes:10171 (10.1 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:160 errors:0 dropped:0 overruns:0 frame:0
          TX packets:160 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:13012 (13.0 KB)  TX bytes:13012 (13.0 KB)

[socratis]

• Open an elevated Command Prompt (right-click, Run-as-Administrator) and execute the command:

  • sfc /scannow

• If it comes with errors that can't be fixed, try to do the same procedure after a safe boot.
• If that doesn't work, try to disable McAfee.
• If that doesn't work, try to uninstall McAfee completely.

[dk1301]

The result of sfc /scannow was :

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Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Windows\system32>sfc /scannow

Beginning system scan.  This process will take some time.

Beginning verification phase of system scan.
Verification 100% complete.

Windows Resource Protection did not find any integrity violations.

Unfortunately since I'm working on my company's pc the uninstall or disabling of McAfee is not an option.
Anyhow than for your help so far.

[socratis]

• See if you can update McAfee.
• See if you can disable parts of it, especially the firewall.

Other than that, I'm out of ideas...

[dk1301]

Hi all, I found a solution for my problem. I changed the adapter from the default intel to the AMD PCNet PCI II (Am79C970A).