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

[Rowland penny]

On 22/07/2019 01:21, Alfonso Conner wrote:
> Hi Rowland,
>
> Currently using Samba 4.8.5
> 2 x DCs running on CentOS 6.10 (Final)
> Configured 1 DC via classic upgrade, and the latter DC join AD forest.
> Would it be alright if I were to redo the classic upgrade?

You can if you want to, but I feel that your problem may have nothing to 
do with Samba.

Your first problem is your choice of OS, Centos 6 is as good as EOL, it 
is in maintenance mode and as such, the various packages may just be too 
old.

you ran 'netstat -plaunt | egrep "ntp|bind|named|samba|?mbd"'

Amongst your output was this:

tcp        0      0 :::3268                     :::* LISTEN 2578/samba
tcp        0      0 :::3269                     :::* LISTEN 2578/samba

Now I am no network expert, but doesn't ':::' mean IPv6 ?

When I run the same command, I get:

tcp        0      0 0.0.0.0:3268  0.0.0.0:* LISTEN 14227/samba: task[l
tcp6       0      0 :::3268       :::*      LISTEN 14227/samba: task[l

tcp        0      0 0.0.0.0:3269  0.0.0.0:* LISTEN 14227/samba: task[l
tcp6       0      0 :::3269       :::*      LISTEN 14227/samba: task[l

As you can 'tcp6' uses ':::3268'

Rowland