Hi Mark,
Under the presumption, as you describe, the DelphixConnector service is not running, it might be java.exe hung up on the windows machine. To find out:
From command line see if port 9100 is in use:
netstat -noba | findstr
"9100 java"
Take notice of the process id (PID), the number at the end of output
Check to see if process java.exe is running - command location would be under DelphixConnector installation, coming from the jre\bin directory under the DelphixConnector directory.
It's possible maybe java process is stuck. If you see this in task manager, try to kill it there.
Alternatively, you can use taskkill:
taskkill /PID <PID Number> /F
Now, start connector to see if it will run this time.
Cheers,
-Paul