Windows Server 2008 R2 dropped network connections

[betan]

Hi all,

We are running our domain controller on a server 2008 r2 standard VM with dhcp/dns/active directory. This is on an OpenSuse 12.1 64 bit host. We are experiencing random network connection dropouts which the NIC becomes totally unresponsive, will not ping out or receive pings in the guest, while internet on the host works perfectly fine. The only way I can fix it is by disabling/enabling the NIC in the guest. This will last for a week or so then it will drop again. Our ethernet card is a Realtek RTL8111/8168. I'm running Intel PRO 1000 MT Desktop as the VBOX adapter type.

Do you have any suggestions on how this can be fixed? Would there be a difference if I switched the adapter type to Intel PRO 1000 MT Server instead? It's very annoying to lose internet connectivity throughout the office every week randomly. Any suggestions is appreciated.

[vasily Levchenko]

Could you please attach the log?

[aeichner]

Please reopen if still relevant with a recent VirtualBox release and you provided the requested information.