Beckhoff CX9020 - Beijer X2 Communication problems

I inherited a project on a Beckhoff CX9020 with a Beijer X2 as HMI.
I have to modify the HMI and I find it painful to download the whole iXDeveloper project to the target each time I change something.
So I tried to run the project from my laptop, but when I do that connection fails and - worse - it disconnects TcXaeshell.
It seems to me that the PLC doesn't like to get two connections from the same IP, but I can't figure it out after a good bit of digging around in the documentation.

Any help would be greatly appreciated
 
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