You may run into this issue when attempting to use the “Log in as current user” option in the VMware Horizon View client. This option allows the user to log in to Horizon View using the currently logged on user’s credentials on Windows clients, so it avoids the need to authenticate twice.
To make a long story short, if “Log in as current user” isn’t working then make sure that your Connection Server’s SYSTEM account has “Access this computer from the network” rights on the local system. You can add it via Group Policy if necessary via the Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\User Rights Assignment\Access this computer from the network policy setting.
For more details, see VMware’s KB on the topic.