If I stop the Rational Application Developer (RAD) Test Environment server (version 5.1), sometimes the shows the error message that the ports (9080, 9090 and 9043) are already opened by another process.
1. See the all running processes in the console:
2. Look for the process id that owns the port numbers. And kill the process(es):
c:\>taskkill /a /PID 3172