Nutanix guest tools (NGT) is a software bundle that you can install in a guest virtual machine (Microsoft Windows or Linux) to enable the advanced functionality provided by Nutanix.
To know more about NGT,its limitation and the requirements
You can give the following document a read
There are situation where NGT communication between the User VM and the Controller VM would be at fault
You might face issues while installing/ upgrading NGT
Do we have a comprehensive troubleshooting guide which might help in isolating the issue and resolving the same?
The following knowledgebase article will help you to troubleshoot NGT issues face in the field