old server was setup with an account that was stoped and the owner has passed loading new key cleared settings or they were lost at some other point
If you still have access to the old server, you may be able to navigate to the Wowza Streaming Engine program folder and make a copy the
content folders. You should then be able to use the info in these folders to recreate the configurations on the new server.
You should be able to copy the folders over completely however, you should make sure the Wowza services are stopped and also back up the old folders first.