If you still encounter the "Initialization Failure" then a stack trace could help.
In the properties for the WACS server, select the checkbox "Show Error Stack". This should send the stack trace back with the response. you can attach it here.
For the WIS_30270 and processDPCommandsEx errors, yes they are typically generic with the real details in the trace logs and the "caused by.." in the stack trace. Typically to troubleshoot those, both the stack trace and full trace logs are required, which involves some deeper troubleshooting that would be difficult on the forums here. For those errors, it may be easier to create a case with Support.
Dan