VM crashes immediately in NAT mode when host Cisco AnyConnect VPN is connected

[DKroot]

I'm running Windows 10 guest in OS X El Capitan host. If I try to use host VPN connection via NAT in VM, VM crashed almost immediately when the host Cisco AnyConnect VPN is connected.

Test case:

1. Launch VM and login
2. Connect Cisco AnyConnect VPN on the host
3. I can see network tray icon in Windows 10 showing disconnection for a couple of seconds
4. VM crashes

This is a critical issue for me because I can't pass USB device and use guest VPN either in Bridged mode: a separate issue. So, I can't use VirtualBox whatsoever for work because of these two issues.

[DKroot]

Log immediately after crash

[Frank Mehnert]

Please provide a crash report or even better a core dump!

[DKroot]

@frank To clarify, do you want me to get Windows dump from the guest?

[Valery Ushakov]

Replying to DKroot:

@frank To clarify, do you want me to get Windows dump from the guest?

No, the core dump of the VirtualBox on the host.

I'll also try to provide a test build with additional logging around relevant parts in the next day or two.

[Valery Ushakov]

What is the contents of /etc/resolv.conf when you connect to the VPN and the VM crashes? Feel free to mask the actual addresses/names.

[Valery Ushakov]

Probably a duplicate of #15948

[edeandrea]

I was having the same issue with an OSX host & windows 10 guest. The solution provided in #15948 worked for me. When connecting to the VPN the /etc/resolv.conf contained more than 6 search entries. When I edited it down to 6 everything worked fine.

Any ideas which version of VirtualBox this fix may get rolled into? Util then you'll have to edit your resolv.conf each time you connect to the VPN.

[Valery Ushakov]

It will be in the next dot-dot releases. Meanwhile you can use a recent test build.

[Valery Ushakov]

#15948