Greetings -
This is to follow-up the problem I wrote about last week with the subject
"Connection failed, nt status bad network name". I am not receiving list
emails for some reason so I can't respond with my solution and keep the
message thread.
The initial symptoms of the problem I was having was showing that backuppc
was showing ping failures to the network host name, and a message of
NT_STATUS_BAD_NETWORK_NAME. This led me to believe that I had a bad name
resolution setup on my network. That was not the case, and the message that
backuppc provides stating that ping to host have failed, is clearly a lie,
and as a result is very misleading when trying to diagnose the true problem.
In my research I saw references to invoking backuppc from the command line
to get more verbose error. So I tried that, and saw that pings were
actually succeeding, even though the web interface was continuing to show
the ping failure error rate climbing.
bash-4.1$ /usr/share/BackupPC/bin/BackupPC_dump -f -v jab-opti755
cmdSystemOrEval: about to system /bin/ping -c 1 -w 3 jab-opti755
cmdSystemOrEval: finished: got output PING jab-opti755.mei.lan
(192.168.112.125) 56(84) bytes of data.
64 bytes from jab-opti755.mei.lan (192.168.112.125): icmp_seq=1 ttl=128
time=0.125 ms
--- jab-opti755.mei.lan ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.125/0.125/0.125/0.000 ms
cmdSystemOrEval: about to system /bin/ping -c 1 -w 3 jab-opti755
cmdSystemOrEval: finished: got output PING jab-opti755.mei.lan
(192.168.112.125) 56(84) bytes of data.
64 bytes from jab-opti755.mei.lan (192.168.112.125): icmp_seq=1 ttl=128
time=0.252 ms
--- jab-opti755.mei.lan ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.252/0.252/0.252/0.000 ms
CheckHostAlive: returning 0.252
Running: /usr/bin/smbclient \\\\jab-opti755\\f -U jeffb -E -N -d 1 -c
tarmode\ full -Tc -
full backup started for share f
started full dump, share=f
Xfer PIDs are now 12258,12257
xferPids 12258,12257
cmdExecOrEval: about to exec /usr/bin/smbclient \\\\jab-opti755\\f -U
jeffb -E -N -d 1 -c tarmode\ full -Tc -
Anonymous login successful
Domain=[WORKGROUP] OS=[Windows Vista (TM) Ultimate 6002 Service Pack 2]
Server=[Windows Vista (TM) Ultimate 6.0]
tree connect failed: NT_STATUS_ACCESS_DENIED
Anonymous login successful
Domain=[WORKGROUP] OS=[Windows Vista (TM) Ultimate 6002 Service Pack 2]
Server=[Windows Vista (TM) Ultimate 6.0]
tree connect failed: NT_STATUS_ACCESS_DENIED
tarExtract: Done: 0 errors, 0 filesExist, 0 sizeExist, 0 sizeExistComp, 0
filesTotal, 0 sizeTotal
Got fatal error during xfer (No files dumped for share f)
cmdSystemOrEval: about to system /bin/ping -c 1 -w 3 jab-opti755
cmdSystemOrEval: finished: got output PING jab-opti755.mei.lan
(192.168.112.125) 56(84) bytes of data.
64 bytes from jab-opti755.mei.lan (192.168.112.125): icmp_seq=1 ttl=128
time=0.268 ms
--- jab-opti755.mei.lan ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.268/0.268/0.268/0.000 ms
cmdSystemOrEval: about to system /bin/ping -c 1 -w 3 jab-opti755
cmdSystemOrEval: finished: got output PING jab-opti755.mei.lan
(192.168.112.125) 56(84) bytes of data.
64 bytes from jab-opti755.mei.lan (192.168.112.125): icmp_seq=1 ttl=128
time=0.209 ms
--- jab-opti755.mei.lan ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.209/0.209/0.209/0.000 ms
CheckHostAlive: returning 0.209
Backup aborted (No files dumped for share f)
Not saving this as a partial backup since it has fewer files than the prior
one (got 0 and 0 files versus 0)
dump failed: No files dumped for share f
>>From the backuppc user, I tried the following and was allowed access. Hmm,
why can't backuppc get access to run the backup?
bash-4.1$ smbclient -L jab-opti755 -W workgroup -U jeffb
Enter jeffb's password:
Domain=[JAB-OPTI755] OS=[Windows Vista (TM) Ultimate 6002 Service Pack 2]
Server=[Windows Vista (TM) Ultimate 6.0]
Sharename Type Comment
--------- ---- -------
ADMIN$ Disk Remote Admin
C$ Disk Default share
D$ Disk Default share
F Disk
F$ Disk Default share
IPC$ IPC Remote IPC
Domain=[JAB-OPTI755] OS=[Windows Vista (TM) Ultimate 6002 Service Pack 2]
Server=[Windows Vista (TM) Ultimate 6.0]
Server Comment
--------- -------
Workgroup Master
--------- -------
In the end I made one change to the host configuration file, and one change
to the server configuration file. The host change that I made was the dhcp
flag. I unchecked the box (dhcp=0). This change eliminated the bad network
name error, but did not resolve the issue. Instead it just showed a new
network error NT_STATUS_ACCESS_DENIED. This indicated to me that somewhere
there was a permissions problem.
Searching through Google results on this showed a lot of discussion about
removing the -N flag from the SmbClientFullCmd line in the main
configuration file. Since many of the discussions were several years old,
and primarily addressing Ubuntu and Debian distributions I was a little
skeptical that it would work, since I am running CentOS6. But, I made that
one change to remove the -N flag from the smbclient command, and my backup
now starts,
It looks like maybe the smbclient -N flag should be removed from the stock
configuration file if it is affecting all the distributions. Also I would
suggest to the developers to change the error output that indicates that
ping is not successful, when ping is actually working, and the problem is
something else. It could prevent a lot of wild goose chases. Thanks.
Jeff Boyce
Meridian Environmental
www.meridianenv.com
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