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Troubleshooting ESX host not responding using vmware checklists.

VMware KB

I ran into this issue while trying to patch ESX hosts. I was able to turn off HA for the cluster and then turn it back on successfully, but it is important to wait for ALL of the ESX Hosts to complete the “Unconfiguring HA” process before enabling HA for the cluster again. This can take several minutes or more minutes on the ESX hosts.

Could not find a valid datastore on host xx.xx.xx.xx.

Usually this is caused by insufficient storage space in the ESX hosts. To solve this, you need to increase the storage for the ESX hosts.

W32AuthConnectionLaunch: Reply error “Cannot power on the virtual machine. This may be because you are running inside a Terminal Services or Remote Desktop session or are in Fast User Switch Mode.

I received this error after trying run my virtual machine  that I copied my backup file to the freshly installed Win 7. It was running fine on my previous Windows Vista 64-bit. Looking at the error, I can’t see any way that I can disable the Fast User Switch Mode in Win 7.

The solution that worked for me is to run the Vmware Workstation using administrative right by right click and run as administrator.

vCenter Server installation failed with the error below.

Error 25060. Setup failed to execute sqlcmd.exe

Go to Microsoft Download Center to download these files:

1) Microsoft SQL Server Native Client
2) Microsoft SQL Server 2005 Command Line Query Utility

It worked for me

Source: Thanks to Vmware Forum