LDAP Server, Healthy but not users and Cache Rebuild timimg out

Hi, I just installed a fresh openldap server with rcdevs sldap Directory. It is working in opnsense correctly.
But in Truenas I configured baseDN and BindDN correctly with port 389. It appeared healthy but there are no user provides in Truenas Usermanagement.
After pressing Rebuild cache I got a timeout.
[EFAULT] Timed out while waiting for domain to come online
Structure is really simple:
cn=user1,ou=users,o=Root
ldif export has all objectclasses truenas should need:
dn: cn=user1,ou=users,o=Root
objectclass: webadmaccount
objectclass: person
objectclass: inetorgperson
objectclass: posixaccount
objectclass: organizationalperson
objectclass: sambaconfig
objectclass: top
uid: user1
sn: 1
preferredlanguage: DE
c: DE
givenname: user
cn: user1
uidnumber: 500
gidnumber: 100
homedirectory: /home/user1
loginshell: /bin/bash
userpassword: {SSHA}J3+d

Can someone give me a hint… me and chatgpt has no other idea :wink: