Michael Phillips Blog » Error

“netvsc” error in Hyper-V guest

Michael — Wed, 21 Apr 2010 18:33:05 +0000

We use Citrix Presentation Server for a number of applications, and lately we have had a significant increase in issues with one set of our Citrix servers. We have 3 main sets of Citrix servers and the problems have only been happening on one set.

One of the sets doesn’t have this error, but wouldn’t because they are physical servers. They have been in production a long time, and we have plans to virtualize them.

The second set doesn’t get the errors, but it is fewer servers and fewer users.

The third set:

is virtual
runs on 2008 R2 Hyper-V
has more servers (6 as opposed to 4 or 5 for the other two)
supports more users and more users per server (averages around 20 users per server during business hours)

Around November, we started upgrading our hosts from 2008 to 2008 R2. The problems have been getting progressively worse peaking in the last 2 months. Our last 2008 host was converted in March.

After some event log review, we were able to correlate some of the issues to the following error in the event log:

Event Type:    Warning
Event Source:    netvsc
Event Category:    None
Event ID:    5
Date:        4/19/2010
Time:        3:49:53 PM
User:        N/A
Computer:
Description:
The miniport ‘Microsoft Virtual Machine Bus Network Adapter #4′ hung.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 00 00 00 00 02 00 52 00   ……R.
0008: 00 00 00 00 05 00 00 80   …….
0010: 00 00 00 00 00 00 00 00   ……..
0018: 00 00 00 00 00 00 00 00   ……..
0020: 00 00 00 00 00 00 00 00   ……..

and right behind that would be this message:

Event Type:    Information
Event Source:    netvsc
Event Category:    None
Event ID:    4
Date:        4/19/2010
Time:        3:49:53 PM
User:        N/A
Computer:
Description:
The miniport ‘Microsoft Virtual Machine Bus Network Adapter #4′ reset.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 00 00 00 00 02 00 52 00   ……R.
0008: 00 00 00 00 04 00 00 40   …….@
0010: 00 00 00 00 00 00 00 00   ……..
0018: 00 00 00 00 00 00 00 00   ……..
0020: 00 00 00 00 00 00 00 00   ……..

After doing a bit of searching and getting a lot of nothing, and doing some on site troubleshooting without much luck, I finally broke down and called Microsoft. I spent a day e-mailing back and forth with someone who was suggesting that I try all the things that I had already tried, so I contacted our TAM and had the case escalated.

The technician then informed me that there was an internal hotfix that had not been fully tested yet, that related to my issue. It seems that in 2008 R2 Hyper-V guests running Server 2003, the network adapter will hang and then reset under heavy load. The hotfix has to be applied to the host and then the integration services on the guest have to be updated. In my environment, when I updated, I had to remove the integration services from the guest before the updated NIC driver would install. I reported this behavior to the technician I was working with, but he said that he couldn’t reproduce that particular problem and that he had no issues updating his test environment.

It is my understanding that the hotfix will be released under KB981836. When you install this, it changes the integration services version from 6.1.7600.16385 to 6.1.7600.20683. You can see this if you look at the driver version on the guest NIC.

The ordinal 120 could not be located in the dynamic link library iertutil.dll.

Michael — Mon, 12 Apr 2010 02:52:51 +0000

We have 5 Citrix Terminal Servers that are configured “identically”. After installing IE8 on two of them, the following started showing up:

After a bunch of searching, I saw a few people have gotten this, but no one had a solution, or at least I couldn’t find it. I did see a similar message related to Adobe Reader, and that is what helped me find the answer to our problem.

One of the servers was not having the problem, but it DID have IE8. hmmm.. It also had Adobe Reader 9 installed on it. The others had Adobe Reader 8.

So to fix the problem, required uninstalling IE8, updating to AR9, and then reinstalling IE8. I did try just installing the updated Adobe Reader, but it still got the error until I uninstalled IE8.

Error installing Integration Services on Hyper-V VM

Michael — Thu, 19 Nov 2009 19:48:34 +0000

I was trying to change from a “Legacy Network Adapter” to a “Network Adapter” on one of my Hyper-V VMs. I added the “Network Adapter” and removed the “Legacy Network Adapter”, and started the machine up. When the machine came up, it wouldn’t connect to the network. Having seen this before I knew exactly how to fix it. Run the Integration Services install again. I did that, and got:

An error has occurred: One of the update processes returned error code 61658

So, being the smart guy that I am, I rebooted and tried again. Same result. The hits I got on google suggested that I was still running an CTP or Beta, but I am running the RTM version (2008 Hyper-V, but not R2 on this one).

I was logging into this machine with a Domain account, but it wasn’t on the network. We use some restrictions on the server desktops and redirect application setting and such, so I thought that might be related.

Here is what worked:

I added back the Legacy Network Adapter (leaving the non-Legacy adapter as well)

I installed integration services again (and it worked just fine)

I removed the Legacy Network Adapter

Now the machine is working just as expected.