[Samba] Samba4 - global catalog (GC) cannot be contacted using Windows 7 RSAT

[Rowland penny]

On 19/07/2019 11:13, Alfonso Conner via samba wrote:
> Hi Samba Team,
>
> Have recently followed Samba guide and successfully migrate from PDC to AD
> and from BDC to join AD forest.
> Need some advice here as I encountered global catalog (GC) cannot be
> contacted issue when using RSAT.
> This message pops up when I click "member of" tab while viewing user
> properties although it will display correctly after I acknowledged the
> error.
> Another similar message related to GC will also pop up when I click to the
> next step while creating new user account, whereby I am aware my newly
> created user might encounter login issues.
>
> After done some research and with reference to previous posts, i noticed it
> has to do with port 3268/tcp and 3269/tcp to be enabled and available.
> After tried various methods to verify but no avail.
>
What OS is the DC running on ?

What version of Samba ?

Things like this used to happen, but they do not occur for myself using 
Win10 against Samba 4.9.6 on Devuan 2 (aka Debian 9)

Rowland