Using the Wowza Manager UI, you can go to the "
Applications" tab and click the "IncomingStreams" link from the left menu.
You should be able to see your incoming encoder stream in the page that loads when clicking that link. You will see the IP address of your encoder and the source port that your encoder is using to publish the stream to Wowza.
Another way of checking if your stream is reaching the Wowza server would be to look at the Wowza logs and search for "publish" events that are logged when your encoder is establishing the connection with Wowza.