The alarm will clear automatically if the error is due to the service being down or network problems and the error condition goes away.
Check the VMware server address and account authentication details have been entered correctly
Use the Spotlight Cloud Diagnostic Server application. The Spotlight Cloud Diagnostic Server application is installed on a Windows server (on-premise or in the cloud) with access to your SQL Server environment.
Double click the Spotlight Cloud Diagnostic Server application desktop icon.
Sign in using your Quest account.
From the configure menu select Connections.
Double click on the connection to check connection details.
VMware server address
Check the address is a valid IP address or hostname of the ESX server or VirtualCenter server.
If you have a VirtualCenter server then connect to that in preference to the ESX host. That way if the virtual machine migrates from one host to another the VirtualCenter server can still be interrogated for data for the virtual machine.
Authentication
Verify the user has at least a read-only role for the ESX server or VirtualCenter server.
VMware Server availability
Verify the VMware server is available and accessible over the network.
VMware server connection requirements
Verify the VMware server fulfills the requirements of Spotlight Cloud.
TCP port 443
Verify TCP port 443 is open.