Ldap userdb prefetch not working

[Marc Roos]

I am having some issues with getting the prefetch working.

In /etc/dovecot/dovecot-ldap.conf.ext I am having:

pass_attrs = 
uid=user,userPassword=password,host=host,homeDirectory=userdb_home,uidNu
mber=userdb_uid,gidNumber=userdb_gid

If I do an ldap search from this location I am able to get these 
properties.

ldapsearch -LLL -W -s sub -D 
"uid=test,ou=xx,ou=xx,ou=xx,dc=xx,dc=xx,dc=xx" -b 
"uid=test,ou=xx,ou=xx,ou=xx,dc=xx,dc=xx,dc=xx" -H 
ldaps://ldap.local:8443 '(&(objectClass=posixAccount)(uid=test))'

Yet I am still having this

Aug 24 19:51:35 auth: Debug: 
prefetch(test,127.0.0.1,<0Qf36aStdJV/AAAB>): passdb didn't return userdb 
entries, trying the next userdb
Aug 24 19:51:35 auth: Debug: 
prefetch(test,127.0.0.1,<0Qf36aStdJV/AAAB>): Finished userdb lookup
Aug 24 19:51:35 auth: Error: plain(test,127.0.0.1,<0Qf36aStdJV/AAAB>): 
user not found from any userdbs

This is my auth-ldap.conf.ext

passdb {
  driver = ldap

  # Path for LDAP configuration file, see 
example-config/dovecot-ldap.conf.ext
  args = /etc/dovecot/dovecot-ldap.conf.ext
}

# "prefetch" user database means that the passdb already provided the
# needed information and there's no need to do a separate userdb lookup.
# <doc/wiki/UserDatabase.Prefetch.txt>
userdb {
  driver = prefetch
}