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
NGT Guide
There are situation where NGT communication between the User VM and the Controller VM would be at fault
Or
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
Nutanix Guest Tools Troubleshooting Guide