Server 2012 - RDP to VM mystery

I have a hyper-v server with two server 2012 vm's

I can RDP to one VM on Win 7 client , but not the other VM.

I tried RDP from one VM to the other VM (which I can't connect to from Win 7). Error about Oracle ccpsd....

So I unchecked the Require Network Level Auth on the VM which I couldn't connect to with Win 7 client. Now I can RDP to the VM.

So, why can I connect to one VM with NLA [x] checked, but not able to connect to the other VM,  unless I uncheck NLA?

Thinking of re-creating the vm...