The VMware ESXi Server is a great piece of software. Also the client is very handy despite the fact that you have to pull your mouse from left to right and back as seen in these screenshots here: Click!
Sometimes you also need to administrate a server from another Windows client or even from a Mac. This is the time when the VMware vSphere Client does not provide anything to do so. The soltution is ThinApp. VMware already provided a Thinapped vSphere Client to download.
When I run this VMware vSphere Client Fling on a Windows 2003 Machine i get the following errors:
VpxClient.exe - .NET Framework Initialization Error Unable to find a version of the runtime to run this application
Which means, that no .NET framework could be found. I found an advise to install .NET Framework 2.0. But after doing this in run into the next error:
Could Not Connect vSphere Client could not connect to ESX An unknown connection error occurred. (The request failed because the client could not validate the server's SSL certificate. (The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.))
The vSphere Client can’t establish a connection with a server which has a self-signed certificate. After doing some more research I found the solution to install .NET Framework 3.5 or higher.
To bypass all the errors above just install .NET Framwork 3.5 which can be downloaded here.