NAT/HostOnly guest can't connect host/internet

[shvbox]

Host Win10, Guest Ubuntu 14.04, network NAT/HostOnly. host ping guest is OK, but guest can't ping host, host can't access Internet.
When vm starts, there's VBox Warning message: Can't connect to the network interface 'DEVICE\{....}', MAC number in {}, can be seen in host as Tunnel adapter isatap, Media state, Connection-specific DNS Suffix
IPs: lo 127.0.0.1 eth0 / eth1: 192.168.0.127
network interfaces: lo iface lo inet lookback, eth0: iface eth0 inet dhcp, eth1: iface eth1 inet static, address 192.168.0.127, netmask 255.255.255.0
eth0 dhcp not get, but get static as eth1
vbox version 4.3 - ugraded to 5.0
Would you help me out?

[socratis]

Well, your post is a little bit too condensed for me, so, could you provide 1) a VBox.log where you have observed the problem and 2) the <VMName>.vbox? Both of them zipped please...

[Perryg]

Also post the results of the following:

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VBoxManage list hostonlyifs

[shvbox]

socratis & perryg,
I've got these 3 files - vbox.log/best.vbox/hostonlyifs.txt, zipped into vbox.zip and attached for your review.
Thank you both for help.

[Perryg]

You have two host only adapters and they are both wrong. Delete the number two host only adapter ( look in preference -> network )
Edit the first one to equal the two screenshots provided. ( see below )

Next your Extension pack does not match the running version of VirtualBox.

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VirtualBox VM 5.0.14 r105127 win.amd64 (Jan 19 2016 16:40:17) release log
00:00:03.846450   Oracle VM VirtualBox Extension Pack (Version: 4.3.12 r93733; VRDE Module: VBoxVRDP unusable because of 'Incompatible extension pack (version '4.3.12'), please update')

Also you are running close to not having enough memory

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00:00:03.845133 Host RAM: 4008MB total, 1184MB available
00:00:04.745939   RamSize           <integer> = 0x0000000040000000 (1 073 741 824, 1 024 MB)
00:00:04.746300   VRamSize         <integer> = 0x0000000000c00000 (12 582 912, 12 MB)

This is what is causing your network issues and should be fixed when you set the host-only network up properly.

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00:00:05.619725 IntNet#0: szNetwork={HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter #3} enmTrunkType=3 szTrunk={\DEVICE\{5D1B39D4-EABA-4970-B7C5-7ACB02F884C7}} fFlags=0x14000 cbRecv=325632 cbSend=196608 fIgnoreConnectFailure=true 
00:00:05.619872 VM: Raising runtime error 'HostIfNotConnecting' (fFlags=0x0)
00:00:05.619928 Console: VM runtime error: fatal=false, errorID=HostIfNotConnecting message="Cannot connect to the network interface '\DEVICE\{5D1B39D4-EABA-4970-B7C5-7ACB02F884C7}'. The virtual network card will appear to work but the guest will not be able to connect. Please choose a different network in the network settings"

host-only-1.png (23.75 KiB) Viewed 3605 times

host-only-2.png (28.04 KiB) Viewed 3605 times

[shvbox]

Perryg,
Deleted HostOnly #2, edited #3 following you.
Result: when start vbox, Error message still there: Cannot connect to the network interface '\DEVICE\{5D1B39D4-EABA-4970-B7C5-7ACB02F884C7}'
ifconfig keeps same.
Can't ping host from guest, and to guest from host either.

[Perryg]

Deleted HostOnly #2, edited #3 following you.

This concerns me. You should not have a number following the name. Delete all of the host-only adapters, reboot the host and add a new one but do not edit it in any way. Then post the results of the following.

• VBoxManage list hostonlyifs on the host
  ifconfig -a from the guests terminal.

Oh and the guest should be shut down completely, not saved state while you are performing the tasks with the exception of the ifconfig from the guest.

[shvbox]

Perryg,
Thanks for your time.
But my problem is still the same. I did as you said - delete host only adapters, and created new one.
Result is like below:

Guest side

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$ ifconfig -a
eth0      Link encap:Ethernet  HWaddr 08:00:27:a8:17:a2
          inet addr:192.168.0.127  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fea8:17a2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:39 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2053 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4614 (4.6 KB)  TX bytes:130786 (130.7 KB)

eth1      Link encap:Ethernet  HWaddr 08:00:27:69:86:83
          inet addr:192.168.0.127  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe69:8683/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:495 (495.0 B)  TX bytes:342 (342.0 B)

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:7830 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7830 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1534672 (1.5 MB)  TX bytes:1534672 (1.5 MB)

$ ping 192.168.0.103
PING 192.168.0.103 (192.168.0.103) 56(84) bytes of data.
From 192.168.0.127 icmp_seq=1 Destination Host Unreachable
From 192.168.0.127 icmp_seq=2 Destination Host Unreachable

==============================================================================
Host:

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>VBoxManage list hostonlyifs
Name:            VirtualBox Host-Only Ethernet Adapter #2
GUID:            13e192dc-6fb6-41f2-ba57-9d02d898a881
DHCP:            Disabled
IPAddress:       192.168.76.1
NetworkMask:     255.255.255.0
IPV6Address:     fe80:0000:0000:0000:70ec:74fa:6d67:87c9
IPV6NetworkMaskPrefixLength: 64
HardwareAddress: 08:00:27:00:74:c9
MediumType:      Ethernet
Status:          Up
VBoxNetworkName: HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter #2

>ping 192.168.0.127
Pinging 192.168.0.127 with 32 bytes of data:
Reply from 192.168.0.103: Destination host unreachable.
Reply from 192.168.0.103: Destination host unreachable.
Reply from 192.168.0.103: Destination host unreachable.
Reply from 192.168.0.103: Destination host unreachable.

Ping statistics for 192.168.0.127:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)

[Perryg]

This still isn't right. Did you change any of the settings of the host-only interface? By default they should be 192.168.56.*
You also seem to be using a static address in the guest host-only which is not a good idea unless you know what you are doing.