pam + ldap: pulling my hair out

[Yan Seiner <yan seiner com>]

I've been trying to figure out how to get pam authentication working 
with ldap.  From what I've read, it should "just work".  In my case, it 
"just fails".

No matter what I try, I get

Jun  3 06:16:42 selene dovecot-auth: pam_ldap: reconnecting to LDAP 
server...
Jun  3 06:16:42 selene dovecot-auth: pam_ldap: ldap_simple_bind Can't 
contact LDAP server

I get this with every service I try; not just imap.

I've turned on debugging in ldap; pam is not connecting to the ldap 
server at all.

AFAICT, I have all of my pam modules set up correctly; at least I've 
followed the debian pam + ldap wiki and it all seems to make sense, 
except that pam never tries to actually connect to port 389.  
/etc/pam_ldap.conf has all the correct uri for the ldap server.

Is there some way to turn on debugging in pam?  Some way to see what 
it's doing?  A way to examine the modules it's using?

Thanks,

--Yan

--
Yan Seiner