The last time I tried to boot up a CUCM 10.5 server I was surprised to find I couldn't even ping between the host and guest. The networking was set up pretty simply, used the default bridged VMware adapter and I was certain I used this server before.
The fix was ultimately to disable the DNE LightWeight Filter on the physical adapter on my laptop. It seems to have been installed recently when I was forced to use Citrix to connect to a clients network remotely.
Below is a screenshot of the ping failures, the DNE Lightweight Filter correctly unchecked. You hit OK at this point, the adapter resets and you might be in business again.