Ldap userdb prefetch not working

Marc Roos M.Roos at f1-outsourcing.eu
Mon Aug 24 23:02:52 EEST 2020

I am having some issues with getting the prefetch working.

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

pass_attrs = 

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

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

This is my auth-ldap.conf.ext

passdb {
  driver = ldap

  # Path for LDAP configuration file, see 
  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

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