The SERVER code is used to generate the SERVER keystring which installs when you license Houdini. This is to authenticate the hardware to run Houdini licenses.

Sometimes these virtual network adapters change how Houdini chooses the primary network device on each reboot, causing the server code to change.

• Open the Command Prompt.
• Type: ipconfig /all
• Check if you have any virtual or VPN devices in your network adapters (for example, one could be Hyper-V Virtual Ethernet Adapter).
• Try disabling the device and reboot a few times to ensure that the server code remains consistent.