LDAP login failure


We have our OpenNebula linked to LDAP for authentication which has been working great for the past two years except today. It seems a new ldap user cannot log in to Sunstone and is getting the error “OpenNebula is not running or there was a server exception. Please check the server logs”

Looking at oned.log I can see:
“Message received: AUTHENTICATE SUCCESS 1481 ldap pd00344 CN=xxxx, OU=xxxx 1”

and nothing appears in the sunstone.log

All other users can log in fine.

LDAP authentication we have faced problem latest version opennebula, we have replaced opennebula authentication file from old openenbula to new openebula

#cd /var/lib/one/remotes/auth/ldap/

[root@Hostname ldap]# scp -r authenticate ipaddres:/var/lib/one/remotes/auth/ldap/

Assume the issue appeared with 6.0, correct?
Could you also share your ldap_auth.conf?

:mapping_generate: true
:mapping_timeout: 300
:mapping_filename: server1.yaml
:mapping_key: GROUP_DN
:mapping_default: 1
:user: XXXX
:auth_method: :simple
:host: XXXXX
:port: 3268
:base: XXXX
:user_field: sAMAccountNAme