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

Rowland penny rpenny at samba.org
Mon Jul 22 08:31:03 UTC 2019

On 22/07/2019 09:23, Alfonso Conner wrote:
> Hi Rowland,
> In fact currently in my test environment using the same version of OS 
> 6.10 and Samba 4.8.5.
> I ran 'netstat -plaunt | egrep "ntp|bind|named|samba|?mbd"', I have 
> :::3268, :::3269, I do not see <> and 
> While I use a Windows PC join to my test domain, I have no issues with GC.
> Not sure how the GC problem can happen but seems to me it looks like a 
> sometimes thing.
> Would the chances of getting be lower if were to use a higher version 
> of OS and Samba? =)
Possibly, but I do not use Centos, so I do not really know :-(
> Now that I have quite a number of Windows PC under this AD, hope you 
> can correct me if I were to use the below steps:
> I referred from Samba wiki
> Example to remove DC1 from AD
> 1) Transfer FSMO to DC2
> 2) Demote DC1
> 3) stop DC1 samba service
> 4) Disconnect DC1 IP
> 5) Configure new_DC1 IP
> 6) Join new_DC1 to AD
> 7) Transfer FSMO from DC2 to the new_DC1
> I am considering to use CentOS 7.6.1810 with Samba 4.10.6 for my 
> new_DC1. Prefer to use back the same hostname and IP address.

you might prefer to use the same name & IP, but experience has shown 
this isn't a good idea, apart from that, the above is a reasonable way 
to upgrade.


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