[Samba] DC controller and DNS

[ve2cii at ve2cii.com]

Hi,

    I am having an issue with the DC controller in Samba and I was 
wondering if someone
could give me a hand?
    Samba version is:

root at dns2:~# samba --version
Version 4.13.9
root at dns2:~#

      I tried to remove everything involving the dns because it is not 
required as I will be updating
the zone file manually. And the zone file is on another machine. When I 
first set up samba
everything was working perfectly including the Active Directory tool on 
the win10 machine.
I suspect something has gone wrong involving a dns update.  Now I am at 
a state where my
windows machine can login but the secondary DC stops working with the 
primary after a
little while, plus the Active Directory tool can no longer connect to 
the DC.
     The error from the log file is:

[2021/08/02 09:17:53.017061,  3] 
../../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
   Kerberos: Server not found in database: 
ldap/dc0.cronomagic.ca/cronomagic.ca at CRONOMAGIC.CA: no such entry found 
in hdb
[2021/08/02 09:17:53.017104,  3] 
../../source4/auth/kerberos/krb5_init_context.c:80(smb_krb5_debug_wrapper)
   Kerberos: Failed building TGS-REP to ipv4:192.168.55.119:49985

     I can send any configuration files if necessary.

    Any help with this would be greatly appreciated.