We installed the Web Admin Console V. 9.2.0.343, on a server where there is different web application already running.  Web Admin Console would not start, citing a conflict with another application using the same port.  Checking App 1, we saw that it was using Port 80 and Port 443 for SSL.  We changed Web Admin Console to Port 81  Still no luck. 

Here are the bindings for the first app:

And for WAC:

If we try to remove 443 from WAC, it shows a message that another app is using that port.  Has anyone else run into this?