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"Client Side Driver Directory Could Not be Cleaned Out"
It was. So I turned it on, rebooted both computers and now get "can't find cqc security server." And I tried turning off windows firewall just to be sure.
Hmmm.... Does everything work on the MS itself? One thing that might be an issue is that the clients may have cached the IPV4 address. On the client, open a command prompt as admin and do:

ipconfig /flushdns

then restart the machine and see if that helps.
Dean Roddey
Explorans limites defectum
Also of course make sure you can ping the master server from the client.
Dean Roddey
Explorans limites defectum
Dean, thanks again.  Everything on the MS works and has worked, and over the course of testing varies configurations, I was always able to ping the MS from the laptop and desktop that have client installations of CQC.  I also flushed the cached DNS.  

I was not able to get past the "can't find security server" when IPv6 was active on the MS so, since I was heading out of town, I turned it off and was able to at least access the AI.

I didn't have (and have not yet had) a chance to test more things, but what is puzzling is that the error about the client side driver not being cleaned out seems random.  I don't do much in the way of changing the client interfaces of the three drivers I have with them so I can work around the notice, and when I am back in town, I'll dig a little deeper.
I wonder if your have something blocking IPV6 addresses but not IPV4?
Dean Roddey
Explorans limites defectum
I looked at that, and thought I had an "ah-ha" moment when I realized my router had an IPv6 option.  But when I checked, it was already enabled and ipconfig on the MS and CQC clients shows an IPv6 address.

Whether something else is block IPv6 traffic is something I need to check.  I tested with Bitdefender uninstalled on the client machine (and it was never installed on the MS) but I need to do more testing and research....

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