http & mod_authnz_pam

[lejeczek]

hi everyone

I'd like to ask about mod_authnz_pam. I've trying to test a 
very simple config, like here:

<Location /svnpam>
     AuthType Basic
     AuthName "pam"
     AuthBasicProvider PAM
     AuthPAMService dovecot

<RequireAny>
       Require valid-user
     </RequireAny>
</Location>

You can see I'm trying dovecot's pam.
But this fails:

...
check pass; user unknown
password check failed for user (me)
pam_unix(dovecot:auth): authentication failure; logname= 
uid=48 euid=48 tty= ruser= rhost=10.3.1.21  user=me
...

This should be simple and should work, right?
many thanks, L.