[Samba] log.samba failure messages

[samba.20.andwin at spamgourmet.com]

Hi,

in our Samba 4.1.6 AD setup (a Controller and a Member Server), the
only remaining error messages are similar to the following three in
log.samba on the Controller:

*** 1 ***
[2014/04/17 15:28:54.647621,  0]
../source4/dns_server/dns_utils.c:282(dns_replace_records)
  Deleting record failed; 50

*** 2 ***
[2014/04/18 09:10:12.046449,  0]
../source4/dsdb/common/util_samr.c:331(dsdb_add_domain_group)
  Failed to create group record
CN=NC_S_ISLCK,CN=Users,DC=my,DC=ad,DC=dom,DC=com: dsdb_access: Access
check failed on CN=Users,DC=my,DC=ad,DC=dom,DC=com

*** 3 ***
[2014/04/18 09:10:21.464080,  0]
../source4/rpc_server/drsuapi/writespn.c:237(dcesrv_drsuapi_DsWriteAccountSpn)
  Failed to modify SPNs on
CN=HOST01,CN=Computers,DC=my,DC=ad,DC=dom,DC=com: error in module acl:
Constraint violation (19)

What implications do these failures have? I'd appreciate any help on
how to troublehoot this.

Best regards
Andreas