The best practise of imaging a Laptop on different Network would be create the image Locally by connecting external drive and saving the image to external drive.
Create a boot CD/DVD or USB using GHost Boot Wizard.
Booted the laptop using boot disk.
connect your external drive and save the image to external drive and bring it to the Server machine.
* What is version of GSS which you have installed on Server machine?
* What is the OS of client machine?
Let me know if you have any Query