Port 8087, if you are using Wowza version 4, is also used by the REST Interface. If changing admin ports, it is best to use a port that is not used by Wowza or any other services. You can run a netstat command to determine what ports are currently being used so that you can select one that is free. If you continue to have issues, do
send us your conf/ and logs/ so that we can further investigate.