I'm not sure what version of Wowza you are using, but a quick check is to edit [install-path]/conf/live/Application.xml and search for PublishMethod. Please confirm that it is set as follows:
If so then please can you also zip up your /conf and /logs folders and raise a ticket by sending an email to email@example.com and we will investigate further.
<!-- RTP/Authentication/[type]Methods defined in Authentication.xml. Default setup includes; none, basic, digest -->