TYPO3 not logged in show login page and not 404 page

Question

I'm running a TYPO3 page with frontend user login.

If a user is not logged in and he clicks on a page that is only visible for logged in users at the moment I got 404 page.

How can I display the a different page then the 404 page?

Thanks in advance.

UPDATE Tried it this way

[PIDinRootline = 68] && [usergroup = *]
# do something
[else]
page.config >
page.config.additionalHeaders = Location: http://www.yourdomain.org/login.html
[end]

but then all pages redirects (run into else branch)

Update:

also tried:

[globalVar = TSFE:id=68] && [usergroup = *]
# do something
[else]
page.config >
page.config.additionalHeaders = Location: http://www.yourdomain.org/login.html
[end]

=> also not working

Answer 1

Thats the working solution:

[globalVar = TSFE:id =68] && [loginUser = ]
page.config >
page.config.additionalHeaders = Location: http://www.yourdomain.org/login.html
[end]