replication-dns child failed to find name

[Alexis]

Hi,

I'm setting up AD replication following this howto:
https://wiki.samba.org/index.php/Samba4/HOWTO/Join_a_domain_as_a_DC#Samba4_joining_a_domain_as_a_DC
DNS entry seems to be set coorectly since

host -t A dc2.samba.example.com.
and
host -t CNAME 737506d0-bfe6-40c8-815d-08c3dff7a67f._msdcs.samba.example.com.
are working but replication failed and I've got these error mesages in the logs:

dns child failed to find name '737506d0-bfe6-40c8-815d-08c3dff7a67f._msdcs.samba.example.com.'

If I add 737506d0-bfe6-40c8-815d-08c3dff7a67f._msdcs.samba.example.com in /etc/hosts then replication work fine.

It seems there is a problem with DNS (internal) but what would you test to sorte out this ?

Thank you.