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Troubleshooting VMware



VMware tools make assumptions that their scripts are run in an interactive session and also present warnings the first time that they are run. As it stands today, you have to run commands interactively after you've installed or upgraded their tools.


The PowerCLI configuration has multiple scopes: Session, User, and AllUsers. Please refer to their documentation for details and on how to properly configure as per your requirements.


Connection to the server failed!

This error message is displayed for various reasons. For a quick diagnostic, launch the VMware vSphere PowerCLI shortcut of the same bitness (32/64 bit) as your Remote Desktop Manager. Some commands will be listed in the table below to diagnose issues in sequence




Have you specified the Execution Policy of scripts?


Have you configured the PowerCLI's InvalidCertificateAction?


Have you configured the PowerCLI's DefaultVIServerMode?



In the PowerShell window : error message appear but it is impossible to read them before the window closes

Remote Desktop Manager ultimately sends a few commands in an encoded script, you can open a PowerShell window and type the following commands sequentially. This way you will have time to see the error messages.


The first command connects with the server, a password prompt will appear:


Connect-VIServer {server ip or name};


The second command lists the virtual machines present on the server. It displays the Name and the ID.


Get-View -ViewType VirtualMachine |  select -Property Name, {$_.Moref.Value};


In the PowerShell window : There were one or many problem with the server certificates

You also see a message related to Set-PowerCLIConfiguration. Please consult and make an informed decision as what is the best course of action when you take your security concerns into account. For users that are comfortable in leaving the default certificate on the VMware server, you can launch a PowerShell command window and run the following:


set-PowerCLIConfiguration -invalidCertificateAction "ignore" -confirm:$false


In the PowerShell window : There is a question about multiple server support

As described in their message, it will be the default value in a coming release. Please consult their documentation and make an informed decision, but most users should accept the Multiple option.


Issues with VMware PowerCLI


The term 'Connect-VIServer' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again



This error occurs because the PowerCLI modules are not linked with PowerShell or the PowerCLI Module for the Connect-ViServer command is missing.



Check is VMware PowerCLI is installed.


Running 'Get-Module VM* -ListAvailable' in PowerShell shows the list of VMware modules installed.


VMware PowerCLI

VMware PowerCLI


You should see 4 VMware modules listed in PowerShell as shown in the image above.


You can test to see if PowerShell recognizes the 'Connect-ViServer' command.


VMware PowerCLI

VMware PowerCLI


By typing the command, we see that PowerShell doesn't have the proper module installed.


In the PowerShell Window, install the PowerCLI modules by using the 'Install-Module' command. Many step by step instructions can be found on Google.


Then type the 'Get-Module VM* -ListAvailable' command again, we can see that the PowerCLI modules are now listed.


VMware PowerCLI

VMware PowerCLI


A Final test with the 'Connect-ViServer' command, by typing it in PowerShell, the connection is established and the issue should be resolved.


VMware PowerCLI

VMware PowerCLI


Additional Troubleshooting


If try on a new computer and have an issue with VimAutomation.Core, you can install it with the command:


Install-Module -Name VMware.VimAutomation.Core -AllowClobber -Scope CurrentUser


After the installation, if you run the command:


Get-Module VM* -ListAvailable


You should get the output below:


VMware PowerCLI

VMware PowerCLI


If you restart RDM with the current user (not running as admin) and open the VMware Dashboard entry, after 30 seconds, you should see all your servers.

If this does not work, create a PowerShell entry, the blue one , select Embedded Script and type the script below:


Import-Module VMware.PowerCLI;
Connect-ViServer "SERVER_IP";
Get-View -ViewType VirtualMachine |  select -Property Name, {$_.Moref.Value};


Click OK twice and try to start the Powershell entry.


If you get an error about execution policies, please refer to


But you can resolve the issue with the following command;


Set-ExecutionPolicy Unrestricted -Scope CurrentUser


Please refer to your administrator to ensure this command is allowed to be used within your infrastructure.