[Samba] Error changing server IP address: ERROR: Connecting to DNS RPC server

[Lorenzo Milesi]

Samba Version 4.12.1

I'm trying to change server IP address from 10.0.0.69 to .3 on a single AD DC running also as fileserver (very small situation). I'm following this [1] guide, I have no interface restrictions in samba or in bind. I stop samba, change IP address, restart bind, start samba, but when I run samba_dnsupdate I get some messages until:


5 DNS updates and 5 DNS deletes needed
Failed to get Kerberos credentials, falling back to samba-tool: kinit for FILESERVER$@WDC.MYDOMAIN.IT failed (Cannot contact any KDC for requested realm)

update (samba-tool): A fileserver.wdc.MYDOMAIN.it 10.0.0.69
Calling samba-tool dns for A fileserver.wdc.MYDOMAIN.it 10.0.0.69 (delete)
Calling samba-tool dns delete -k no -P ['10.0.0.3', 'wdc.MYDOMAIN.it', 'fileserver', 'A', '10.0.0.69']
ERROR: Connecting to DNS RPC server 10.0.0.3 failed with (3221225653, '{Device Timeout} The specified I/O operation on %hs was not completed before the time-out period expired.')
Failed 'samba-tool dns' based update of A fileserver.wdc.MYDOMAIN.it 10.0.0.69
update (samba-tool): A wdc.MYDOMAIN.it 10.0.0.69
Calling samba-tool dns for A wdc.MYDOMAIN.it 10.0.0.69 (delete)
Calling samba-tool dns delete -k no -P ['10.0.0.3', 'wdc.MYDOMAIN.it', '@', 'A', '10.0.0.69']

And here starts looping between different records update, failing with the same timeout error.


/etc/resolv.conf:
nameserver 127.0.0.1
search wdc.mydomain.it

/etc/krb5.conf
[libdefaults]
        default_realm = WDC.MYDOMAIN.IT
        dns_lookup_realm = false
        dns_lookup_kdc = true

[realms]
WDC.MYDOMAIN.IT = {
        default_domain = wdc.mydomain.it
}

[domain_realm]
        fileserver = WDC.MYDOMAIN.IT


/usr/local/samba/var/log.samba
[2020/05/08 18:30:05.360609,  0] ../../source4/dsdb/dns/dns_update.c:86(dnsupdate_nameupdate_done)
  dnsupdate_nameupdate_done: Failed DNS update with exit code 110


What am I doing wrong? thanks

[1] https://wiki.samba.org/index.php/Changing_the_IP_Address_of_a_Samba_AD_DC#Changing_the_IP_Address_of_an_AD_DC_in_a_Single-domain_Environment
-- 
Lorenzo Milesi - lorenzo.milesi at yetopen.it

YetOpen S.r.l. - https://www.yetopen.it/
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