I would double check the webserver settings in TinyCam. If you are getting prompted for a username/password, then it thinks you have one or both configured.
If I remember correctly, at least the username is filled in by default so you either need to clear both the username/password or configure them both and embed them in the URL:
I would also review the following thread starting around this post as it has some helpful tips and screenshots:
And this one has some screenshots specific to the webserver configuration: