You can rewrite the VNC password by using SolusVM.
1. Login to your SolusVM Control Panel.
2. If you have multiple VPS, select the appropriate one.
3. Scroll down, and enter your new password in the VNC text box under the “VNC Password” tab then click on “Change” option.
4. It will prompt for a confirmation. Click “Yes” and then reboot your VPS.