Transfer Cookie Domain

I just want to move my forum from www.emuenzen.de to forum.emuenzen.de. As a first step I changed the option in the config.php from:
$config['cookie']['domain'] = '';
to
$config['cookie']['domain'] = '.emuenzen.de';

Then I logged out and tried to re-login. But it failed - I can´t login anymore.
When I change the setting again to ''; everything is fine.

What am I doing wrong?

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