[Dovecot] LDAP authentication blank password

[Matheus Antonio Oliveira]

People,

I have a situation: when use a passwd LDAP module against "microsoft 
active directory" and one user send a blank password the authentication 
module returns: "ERR [IN-USE] Internal login failure. Refer to server 
log for more information."; after this the authentication module never 
authenticate again "ERR Temporary authentication failure."

Thanks in advanced.

Trying 0.0.0.0...
Connected to 0 (0.0.0.0).
Escape character is '^]'.
+OK Dovecot ready.
user xyz at domain
+OK
pass <BLANK>
-ERR [IN-USE] Internal login failure. Refer to server log for more 
information.
Connection closed by foreign host.

Trying 0.0.0.0...
Connected to 0 (0.0.0.0).
Escape character is '^]'.
+OK Dovecot ready.
user xyz at domain
+OK
pass correct-password
-ERR Temporary authentication failure.


-- 
Matheus Antonio Oliveira