[Samba] Errors with the installation of Samba 4.4.5.

[Igor & Sandra]

I have some errors with the installation of Samba 4.4.5.

I glued the outputs and config on pastebin: http://pastebin.com/V4VCDfs0

Can anyone tell because the status of the samba is in error:
Jul 27 17:26:47 srv-dc1.homelab.corp samba[978]:
../source4/dsdb/dns/dns_update.c:295: Failed DNS update -
NT_STATUS_IO_TIMEOUT


And samba_dnsupdate --verbose --all-names command gives the following error:

Traceback (most recent call last):
  File "/usr/local/samba/sbin/samba_dnsupdate", line 632, in <module>
    get_credentials(lp)
  File "/usr/local/samba/sbin/samba_dnsupdate", line 124, in get_credentials
    raise e
RuntimeError: kinit for SRV-DC1$@HOMELAB.CORP failed (Cannot contact any
KDC for requested realm)