Hi,
Which network settings are you using?
You should definitely use static IP addresses, and avoid 169.x.x.x addresses (these are automatically assigned by your computer and tend to change).
Please do the following:
Take screenshots of your existing network settings, just to be safe.
Then, manually assign one of these IP addresses to the computers in your setup: 192.168.0.x or 10.0.0.x, and assign a subnet mask of 255.255.255.0, then it should work.
If it does not, send screenshots of your network settings to support@vsl.co.at, we´ll try to help you asap. Network support is basically not part of our tech support (just to have said it), things can get quite complex, depending on your environment, knowledge and expectations...
Best,
Paul