[Samba] named will not start after upgrade of CentOS

[Paul R. Ganci]

Well I may have been over zealous and upgraded my Samba AD server to 
CentOS 7.5. After doing so the named service will not start. The error 
message I get is:

May 12 00:50:55 nureyev named[11351]: Loading 'AD DNS Zone' using driver 
dlopen
May 12 00:50:55 nureyev named[11351]: dlz_dlopen of 'AD DNS Zone' failed
May 12 00:50:55 nureyev named[11351]: SDLZ driver failed to load.
May 12 00:50:55 nureyev named[11351]: DLZ driver failed to load.
May 12 00:50:55 nureyev named[11351]: loading configuration: out of memory
May 12 00:50:55 nureyev named[11351]: exiting (due to fatal error)

Everything was fine with the previous version of CentOS 7.4. If I 
comment out the line from /etc/named.conf

//        include "/var/lib/samba/private/named.conf";

then named starts up. Permissions were correct prior to the upgrade and 
after upgrade:

 > cd /var/lib

 > ls -alt | grep samba
drwxr-xr-x  10 root           root           4096 May 12 00:50 samba

 > ls -alt ./samba | grep private
drwxr-x---   8 root named                     4096 May 12 00:59 private

 > ls -alt ./samba/private | grep named.conf
-r--r--r--  1 root root      241 May  6 12:24 named.conf.update
-rw-r--r--  1 root root      720 Apr 15 17:00 named.conf

Needless to say the failure for named to start is causing serious 
issues.  If  I could take back the upgrade I would. I am running the 
Sernet 4.7 packages.

Here is what I tried. First a downgraded bind from 9.9.4-61 back down to 
9.9.4-51-4.2. That did not help. So next I tried recompiling the 
packages on the upgraded system and replacing 
/usr/lib64/samba/bind9/dlz_bind9_9.so with a recompiled version. That 
did not help.

Any other ideas on how to debug or fix the problem?

Thank you for your help.

-- 
Paul (ganci at nurdog.com)
Cell: (303)257-5208