The FLEXlm license manager used by Maple looks for the network card labeled "eth0" on Linux (or "en0" on Macintosh). If there is no card labeled eth0/en0 the license manager will return an error.
There should be a way to remap your network cards so that a specific one will always appear as eth0. The exact instructions may vary depending on the operating system.
1. Edit your "70-persistent-net.rules" file as follows:
> sudo gedit /etc/udev/rules.d/70-persistent-net.rules
2. Locate the current mapping of the network card (e.g. "eth1") and change this to "eth0":
NAME="eth0"
3. Restart the computer.