[Samba] changes on DC not replicated, while showrepl reports no issues

[mj]

Hi,

Again more data: The command
  samba-tool visualize reps
seems to agree with the observed lack of replication from DC4 to DC3 & DC2:

> RepsTo objects for DOMAIN
>                                                                                                        destination
>                                                                                                   ,--- CN=DC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
>                                                                                                   |,-- CN=DC3,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
>                                                                                            source ||,- CN=DC4,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com
> CN=DC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com 011
> CN=DC3,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com 101
> CN=DC4,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=samba,DC=company,DC=com --0
> 
> Data can get from source to destination in the indicated number of steps.
> 0 means zero steps (it is the same DC)
> 1 means a direct link
> 2 means a transitive link involving two steps (i.e. one intermediate DC)
> - means there is no connection, even through other DCs

I hope formatting survives.

ABove it says: "no connection" for DOMAIN from DC4 to DC3 / DC2.

Even though there is nothing in between our DCs. No firewalling, all in 
the same subnet, etc.

Anyone can explain more..?

MJ