---
title: "Troubleshooting installation and licensing"
canonical: "https://help.vicon.com/space/Nexus216/11614096/Troubleshooting%20installation%20and%20licensing"
format: markdown
---
The following issues are known to exist when using VAULT and the Sentinel license manager.

> Macro (scroll-tablelayout)

| **Issue** | **Workaround** |
| --- | --- |
| In some cases, if IPv6 is set to **On** in the network properties on the client PC, the server fails to respond to license list requests and the software does not find a license. | In the Windows network properties, turn off IPv6. This enables Vicon Product Licensing to display the license list and the software to find a license. |
| If you're using Windows 11 with a Sentinel Safenet dongle driver that is earlier than 7.6.0, your Safenet dongle is not recognized, producing an error in Vicon Product Licensing and the Windows Device Manager. | Download the latest Sentinel dongle driver (7.6.0 or later) from the [Thales Support Portal](https://supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb_id=e88691ba37edcb08cc47261953990e80&sysparm_article=KB0016514) and install it. |
| When you're using a version of Nexus later than 2.15, network licenses using a license server with a Sentinel License Manager version that is earlier than 9.8 report license lost/restored messages in the Log. | If you're using Nexus 2.16, update your license servers to use Sentinel License Manager 9.8. |
| If you uninstall the latest version (9.8) of the Sentinel License Manager and install an older version, none of your previously available network licenses are displayed. | If you need to use an older version of Sentinel License Manager:<br>1. Copy:  
*C:\Program Files (x86)\Common Files\Thales\Sentinel RMS License Manager\WinNT\lservrc *   
to   
* C:\Program Files (x86)\Common Files\SafeNet Sentinel\Sentinel RMS License Manager\WinNT\lservrc *
2. Either reboot the machine or stop and then restart the Sentinel RMS License Manager service. |
| If you're using VAULT version 1.6 or later, versions of the license server earlier than 9.8 are not displayed in the **Available servers** list or in the 9.8 version of the WlmAdmin utility. | To specify a license server on your network, select **Use a Specific Network License Server**, enter the name in the **License Server** field, and click **OK**. |