Mountain lion connection problems:

Here is the set up.
We were once an all PC office, but as the PC's have been biting the dust, we've installed Macs. One of the two remaining PC's died, so we installed a new Mac mini in it's place.
Now, this Mac Mini is the only Mountain Lion machine in the office. It is hooked to the intranet, and can see and interact with the Internet. BUT, I've tried to do two things unsuccessfully:
1) Connect to our internal image server which is an older X-Serve (Quad core Xeon) running 10.6.8
2) Make contact with my Remote Desktop (running the most current version--updated earlier today) from my Mac Pro running 10.7.5
The first goal was # 2, as I'm travelling, and can't sit at the machine itself. But, I've verified that all of the network settings, the sharing settings etc, are all identical on the Mountain lion machine as they are on the Lion and Snow Leopard machines that connect just fine and can be controlled just fine.
I gather that Mountain lion is different enough that there must be some other default setting that needs to be adjusted. Suggestions please!!
Thanks in advance.
Adam

I'm having similar problems with a 2012 13" MacBook Air. It's brand new, came installed with Mountain Lion.
I get disconnected from the wireless randomly and the wireless icons turns gray. Like you, I have an iPad, multiple computers and they all work fine.
Instead of restarting the router, I go into Safari and do a network diagnostics and it picks up the connection easily enough.
No solution as of yet, but I posted a topic here if you want to follow it:
http://forums.macrumors.com/showthread.php?p=15435867

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