DMA2100 won't reconnect to VMC

Just got a DMA2100. Set it up as an extender, all worked fine(ish)!
Tried it next morning...get "Waiting for PC...." then eventually times out. I can ping the extender from the Media Center PC so it appears the extender is connecting to the network OK.
Only way to get it working again is to go through the setup again and it operates OK until I try it again the next day.
No firewalls in my network and have installed latest firmware on the extender. No messages logged in event viewer on the PC after powering on the extender on the PC which makes me think the extender is having trouble finding the PC for some reason. 
Any ideas?
Solved!
Go to Solution.

The problem you experienced is often caused by firewall on the VMC. Most firewalls would re-enable every after reboot and that's why sometimes it would block the communication to the DMA. Assuming you really don't have a firewall, you can try removing the extender from the Media Center application and re-setup it all again.
Now, if it still doesn't help you can try checking the Event Viewer on your computer then go to Applications and Services Local. Click on Media Center and check for Errors then record the Event ID. You can then go to the link below to check what the Event ID means so you can determine what's causing the communication problem.
http://technet.microsoft.com/en-us/library/cc733489.aspx

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    turn off bluetooth and mouse.  Turn on bluetooth.  Open system preferences.  Open mouse. It starts searching. then Turn on mouse.  Hey presto! (and much to my surprise) it found it.
    It also worked if I left the mouse on, and turned it off and on after opening the mouse in system preferences and it had started searching.  But if, for example, I turned on the mouse before opening system preferences,it was no go.
    There is another issue:  I (like I suspect a lot of people) switch between lion and snow leopard (Macbook Pro and Mac Mini respectively), and every time it has to be paired manually. I have found I have to use the entire process shown above with both OSs.
    Also, the mouse has to be paired to Lion at every startup.  I never have to re-pair the mouse with Snow leopard on startup (unless it's been paired to Lion in the meantime!). 
    I hope that some of this might help someone, even just a little.

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