WN370 Data ports

Hi, 

I've got a network running with a WC7600v1 and a couple of WN370 and WNDAP660 AP's. Due to building limitations no additional network cables can be added to the rooms in questions (this is important). 

I've got the WN370 deployed in a few dedicated sound studios and rehearsel studios with such thick walls for sound isolation that no other wireless signal passes through. Unfurtunately these rooms are only equipped with 1 netwerk outlet. For a new project i require additional network outlets there. I've checked the WN370 and it has the 4x 100Mbit additional data ports. 

I plugged in my laptop in these ports and i'm getting connection but i don't have any connection to the network. I'm guessing as the WN370 has a VLAN trunk this could be an issue. I however, cannot seem to find any configuration option for these ports (and cannot find anything in the manuals). 

Is there any golden tip or are these ports not usable with VLAN trunking? 

Thanks in advance!