Cannot join QNAP to Domain

[mrmarkuz (Markus Neuberger)]

You may try to disable strong auth:

Connect FreeNAS to Nethserver Active Directory

I think I found at least another workaround on the internet for joining FreeNAS 11 U2 to Nethserver AD when FreeNAS and TLS not enabled in samba RE-SOLVED! is not working for you. The tip came from https://forums.freenas.org/index.php?threads/freenas-11-samba4-ad-dc-cant-contact-ldap-server.55148/#post-386987 WARNING! This is just a workaround because it deactivates the strong auth requirement on your DC, which might be relevant from perspective of security. Quick and dirty way for testing: …

Samba wiki:

https://wiki.samba.org/index.php/Updating_Samba#New_Default_for_LDAP_Connections_Requires_Strong_Authentication