Archive for the ‘Virtualisation’ Category

VMware, UAG, DirectAccess pt2

October 24, 2011 Leave a comment


Hallo again Smile


Had some rather nifty issues with a DirectAccess array the other week – so I thought I would return here and blog it! Smile


In short, everything was working fine apart from one very small part – “Manage Out” via IPHTTPS tunnel wasn’t functioning.


In short, clients were connecting the IPHTTPS tunnel before the Teredo was up. Whilst IPHTTPS is connected it will be preferred over Teredo (or 6to4) and disconnects after a random amount of time.

Clients could route traffic down here – so connecting to Intranet services was fine. Tunnel was up on both parts (Intranet/Infrastructure) and everything worked fine apart from “Manage Out”. Routes all fine, Windows Firewall (client-side) all fine.


Queue some hair tearing etc etc.


Raised a call with MS eventually – and in short its VMware causing the issue.


To quote MS (slightly edited to make sense outside of the Email trail);


We have had similar cases before where VMWare template provisioning was used for the UAG hosts, and can confirm that the problem was down to the template creating duplicate adapters that would affect tunnel bindings when configuring UAG DA. And the solution was to rebuild using standard media which completely addressed the issue.


Ouch. Oh well, rebuild we must (I’ll update once they are done!)


Had some other interesting information too regarding VMware, Unicast and DA NLB. I’ll update my original post here


Hosts “not responding” after joining Virtual Centre to Active Directory

March 2, 2011 Leave a comment

Had a bit of a scary moment today – joined the Virtual Centre server to an AD so I could install backup technologies onto it.


All went fine aside from when I opened the vShpere client – all my hosts were marked as “not responding”.


Re-connected the hosts (as it can be seen above) – and the hosts popped back in and then back out again. Hmm not good!

Checked DNS, all right as far as I can see. Checked time sync, all right again.


Rather bricked myself, so off I went uninstalling the Virtual Centre server and reinstalling (using the existing DB) and voila! all is good.


In short, if you do have to join your Virtual Centre to AD, do it before you put Virtual Centre on it or reinstall afterwards!

Cluster Firewall issue – An item with the same key has already been added.

January 29, 2010 1 comment

When running a HA cluster verification you may get the following;

An error occurred while executing the test.
There was an error verifying the firewall configuration.
An item with the same key has already been added.

This is typically because the NIC GUID is duplicated between cluster nodes.

This could be because servers were deployed from an image, or cloned. Personally I had this with a VMware deployed server from a Template.

Remove and re-add a new NIC (add the new one first to be sure) and re-validate 🙂

Timedrift with Linux Guest VM under Hyper-V R2

January 21, 2010 4 comments

Recently had a Linux guest VM timedrifting considerably under Hyper-V R2. I contacted the Linux IC team, who responded stating there was a known issue and they had written a script to “work around” it 🙂

Below is the Linux Clock Sync script.

DISCLAIMER: I did not write this script, nor will I be able to support you on the use of it. Any issues should be sent to the support email address at the end of the script.

Read more…

Bug in the VMWare customisation wizard and 2008 R2?

January 18, 2010 Leave a comment

Again, not sure if it is a “bug” persay, but when I use the vSphere (update 1) Customisation Wizard, it doesn’t seem to “complete”;




That appears every reboot – and it doesn’t manage to set things like the Computer name, or join it to Active Directory.


Works ok with 2008 stock, just not R2…. ?

SLES 10.2 under Hyper-V

December 23, 2009 Leave a comment

SMP is not supported in Linux VM’s at this time with the IC’s loaded. If the IC’s aren’t loaded, then SMP works, albeit with lower I/O performance. Linux VM’s without IC’s are not supported by Microsoft.

You will find that attempting to boot the VM in SMP mode with IC’s loaded you will get the following;


VMBUS: SynIC version: 1

Moving forward, MS have identified the fix and will fix it in a future release. To fix the issue, you need to compile your own 2.6.32 kernel and apply a patch to make the IC’s SMP safe. At this time, the SMP fix is not publically available.

Windows 7 (and 2008 R2) – Getting the vSphere client to run!

December 15, 2009 2 comments

EDIT:My apologies to Simon from Techhead – I mean to cause no offence by copying and pasting his blog (nor did I mean to pass it off as my own work)

I have removed said post, and just left the link through to his site 🙂

I belive Update 1 resolves this “properly” – however for archaic reasons here is how to run vSphere client under Windows 7 / 2008 R2


Simon @ Techhead has posted a rather spliffing guide on how to enable the vSphere client under Windows 7 (and presumably 2008 R2)’;