VRTX networking issues

Good morning guys. I'm currently in the process of reinstalling a PowerEdge VRTX server with 3 M630 blades in it, that we acquired from a customer's existing IT infrastructure that was installed by a previous IT company.

Now the installation of the blades and configuring of the chassis wasn't any problem. But getting the network to function is a completely different story. I've even had to pull out and read all of the manuals.... without any success, btw.

So the situation is like this. I have the first 4 external ports gi0/1 up to gi0/4 on the embedded R1-2401 switch plugged into out Cisco Catalyst 2960-X switch. On both sides of the connections the ports are configured as trunk ports, as we're using a large amount of VLANs for network segregation. From the Dell Network Administrator I've set the internal ports gi1/1 all the way up to gi3/4 up as general ports allowing only tagged VLAN 4 to pass through (our Business VLAN for computers and servers). But for some reason the network is not being passed through to the blades.

The annoying thing is that even when there's no physical network connection plugged in, the Windows OS on all blades seems to thing there's 4 NICs connected to a Gbit network. I'm assuming this is just due the fact that the blades have an internal connection to the physical switch on the back of the chassis. 

Anyway, I'm probably just doing something really simple wrong, but after about 6 hours of trying to fix it myself I'm turning to you guys for some needed support. So anything that can point me in the correct direction would be greatly appreciated.  

May thanks in advance,

Kris