[Samba] Failed DNS update - NT_STATUS_IO_TIMEOUT ( and solved)

L.P.H. van Belle belle at bazuin.nl
Fri Feb 27 01:58:39 MST 2015

Just a tip for the people reading the list. 
if you see Failed DNS update - NT_STATUS_IO_TIMEOUT  or messages :  RPC unavailable if you connect from windows client to the samba AD DC server
Read this.
I have a "test' AD DC on a XEN server running and this DC does nothing. 
1 pc ( win7) is joined, some dns recored are set, nothing special.. 
today i checked the logs, and totaly out of the blue is see..  
[2015/02/24 15:11:44.480393,  0] ../source4/smbd/server.c:370(binary_smbd_main)
  samba version 4.1.16-SerNet-Debian-9.wheezy started.
  Copyright Andrew Tridgell and the Samba Team 1992-2013
[2015/02/24 15:11:44.736117,  0] ../source4/smbd/server.c:488(binary_smbd_main)
  samba: using 'standard' process model
[2015/02/24 15:11:44.968111,  0] ../lib/util/become_daemon.c:136(daemon_ready)
[2015/02/26 02:22:16.882555,  0] ../source4/dsdb/dns/dns_update.c:294(dnsupdate_nameupdate_done)
  ../source4/dsdb/dns/dns_update.c:294: Failed DNS update - NT_STATUS_IO_TIMEOUT
[2015/02/26 02:32:16.902489,  0] ../source4/dsdb/dns/dns_update.c:294(dnsupdate_nameupdate_done)
  ../source4/dsdb/dns/dns_update.c:294: Failed DNS update - NT_STATUS_IO_TIMEOUT
.... until today.. 
now i did see.. 
samba version 4.1.16-SerNet-Debian-9.wheezy started.

and i just remembered i saw and upgrade to 4.1.17.. 
apt-cache policy sernet-samba-ad
  Installed: 99:4.1.17-9
  Candidate: 99:4.1.17-9

so correct.. 
( for debian apt-get install debian-goodies ) 
i checked with : checkrestart 
and checkrestart reported me to restart: 
service sernet-samba-ad restart
service ssh restart
service sudo restart
service sernet-samba-smbd restart
service sernet-samba-nmbd restart
service bind9 restart

restarted, checked again, again the same restart where adviced. 
so i restarted the server, and here you go... 
away are the 
Failed DNS update - NT_STATUS_IO_TIMEOUT messages. 
Point of this story.. 
if you have : RPC Errors, or Failed DNS update - NT_STATUS_IO_TIMEOUT 
check the running version and the installed version and restart samba services or your server. 

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