Secure LDAP Issue

[jxdn]

Details:

• Dex version 2.27.0-2
• OS Centos 7.9
• Installation type: ondemand-dex

Config:

connectors:

• type: ldap
  id: ldap
  name: LDAP
  config:
  host: ldapserver:636
  insecureNoSSL: true
  bindDN: cn=readonlyroot,dc=cm,dc=cluster
  bindPW: PASSSWORD_EX
  rootCA: /etc/certs/ca.pem
  userSearch:
  baseDN: dc=cm,dc=cluster
  filter: "(objectClass=posixAccount)"
  username: uid
  idAttr: uid
  emailAttr: mail
  nameAttr: gecos
  preferredUsernameAttr: uid
  groupSearch:
  baseDN: ou=Group,dc=cm,dc=cluster
  filter: "(objectClass=posixGroup)"
  userMatchers:
  - userAttr: DN
  groupAttr: member
  nameAttr: cn

Error:

Internal Error:
Login error: ldap: initial bind for user "cn=readonlyroot,dc=cm,dc=cluster" failed: unable to read LDAP response packet: unexpected EOF

using ldapsearch:
ldapsearch -x -D "cn=readonlyroot,dc=cm,dc=cluster" -w PASSWORD_EX
There is no error or issue (Password correct)

Any idea how to solve this ?