Pagelocker gives 503 error from web - works when logged into manager

Hi,
Is that what ought to happen? The pages I want to protect were visible from the web to anonymous users before I tried to protect them with pagelocker. Now I get a 503 error when I try to access them. Tried clearing/deleting all caches, clearing browser cache, using different browsers etc. I can see the pagelocker page when I'm logged into the manager and use 'view'. Anyone got any ideas? What I'm trying to do is protect the 'register' page so that only those we want to register will be able to do so.
Thanks
Allan

I just tried it on my local MAMP installation (2.3 at that, had to install from local) and it's working just fine. Please try double-checking the installation instructions, and make sure you have the password-form page published.

(I get the 503 error if the password-form page is unpublished)

Thanks for your assistance yet again.
Publishing the page fixed it
regards
Allan