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You no longer can install vSphere C# Client on Windows Domain Controller in vSphere 5.5

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In the last couple of days I have noticed several folks comment on a new check that has been put in place in vSphere 5.5 which prevents a user from installing the vSphere C# Client onto a Windows Domain Controller system. If you try to install the vSphere C# Client on a Domain Controller system, you will get the following error message:

It is generally not recommended to install additional software on a Windows Domain Controller and I suspect this check was put in place to deter users from installing additional software, including VMware software onto a Domain Controller system. However, for a development environment or home lab, you may want to consolidate multiple applications onto a single system and help reduce the number of Windows systems that you may need to deploy. Luckily there is a way to by-pass this check and I am actually glad one exists as this is something I will need while building out some of internal labs.

Disclaimer: This is not officially supported by VMware, please use at your own risk.

To by-pass the check, you will need to launch the vSphere C# Client install from the command-line and pass in the following arguments:

VMware-viclient.exe /v "SKIP_OS_CHECKS=1"

Now the installer should allow you to proceed with the vSphere C# Client installation.

How to clear the ARP cache in ESXi prior to vSphere 5.5

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Yesterday, I wrote an article about a new ESXCLI command that will be available as part of the soon to be released vSphere 5.5 release which allows a user to clear the ARP cache on an ESXi 5.5 host. It was my understanding that with past releases of ESXi, that it is not possible to clear the ARP cache. While working on that article, I came across an internal thread and learned that it was possible to clear ARP entries prior to ESXi 5.5, however the method is not as ideal as using the new ESXCLI command.

Disclaimer: This is not officially supported by VMware, please use at your own risk

In ESXi 5.1, you can list the current ARP entries for an ESXi host by running the following ESXCLI command:

esxcli network ip neighbor list

To clear a particular ARP entry, you will need to use the unsupported vsish interface. To delete a specific ARP entry, you will need to run the following command:

vsish -e set /net/tcpip/v4/neighbor del [IP-ADDRESS]

Here is a screenshot of listing the current ARP entries using ESXCLI and then deleting one of entries using vsish:

As mentioned in my previous article, I am glad we have made this into an official command in ESXCLI 5.5, but if you are in a crunch you can still clear an ARP entry if you are not running ESXi 5.5 using vsish.

VMware nested easter egg

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It is only fitting that if a VMware Engineer adds a hidden easter egg, that it would of course contain another nested easter egg! For those of you who are not familiar with the vPong easter egg, Raphael Schitz wrote an article about a year ago regarding this little nugget which is when I first learned about this as well.

The easter egg allows you to play a game of old school pong using either VMware Fusion, Workstation, Player and it even works on vSphere. To enable this easter egg, you just need to mount a 0 byte floppy image located on your desktop (not a datastore) to a virtual machine and power it up.

Here is a screenshot of mounting a dummy floppy image which I created using the "touch" command on my Mac OS X system and connecting it to a Fusion VM:

Once you power on the VM, you should now see a game of vPong in the VM console which you can then play against the computer using your mouse.

One would think the easter egg stops there, but nope, there is actually more. If you click into the VM console and type the word "pride" (all lower case), you will see that the black/white vPong game will now change to color! To disable the color, you just need to type the word "pride" again and it will go back to black/white.

I thought this was actually pretty cool and thanks to Regis Duchesne for sharing this tidbit! So the next time you are bored, you can always kill some time with the classic black/white pong or go for the more colorful version 🙂