NT Backup Often Fails due to log on failure preventing the scheduled task from running.

Posted on 2011-09-12
Last Modified: 2012-05-12
We use NTBackup for a client running Windows SBS 2003 SE to run a daily backup scheduled to run every evening.

The backup is regularly failing to run but there is no consistent pattern.

When the backup fails there is no report logged for it within the NT Backup Logs, but if we look at scheduled tasks this shows that the task could not run. Looking at the scheduled task log  this shows:

"Daily_Backup15042011.job" (ntbackup.exe) 10/09/2011 23:00:01 ** ERROR **
      The attempt to log on to the account associated with the task failed, therefore, the task did not run.
      The specific error is:
      0x80070569: Logon failure: the user has not been granted the requested logon type at this computer.
      Verify that the task's Run-as name and password are valid and try again.

The job runs with Domain Admin credentials and re-entering these into the job properties allows the job to run again for a few cycles but then fails again for the exact same reason.

I have looked at the following EE entry for this but this doesn't help unless I am missing where I can check the log on parts suggested in the solution. This problem happens irrespective of when the server was rebooted,

The event log does not have anything in it against the time that this job should begin.

I'd like to know if there is a known 'cure' for this.

Question by:mtxit
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Expert Comment

ID: 36522297
Hello, do you have another admin account you can try in the creentials section? If the task is being run locally try creating a local admin account and use those credentials.

Easier this way than to spend hours getting to the bottom of something which might be solved with a simple new user account.

LVL 12

Expert Comment

ID: 36523132
You shouldn't really be touching the scheduled task entry for NT Backup in SBS2003 at all.  You need to configure the backup using the wizard from the server management console.

Krypton, there is no local admin on an SBS box.
LVL 12

Expert Comment

ID: 36523237
Usually the NTBackup scheduled task runs under SYSTEM account if it is configured correctly.   The scheduled task launches BKPrunner.exe which resets the Backup Operator password and enables the account in AD, then the Backup Operator account logs in and launches the NTBackup process.  (So that it can use NT Backup Operator permissions to backup files regardless of normal NTFS permissions).

So there are quite a few ways this can go wrong.  Does the Backup Operator Account exist in AD?  Does the Domain Admin account you are trying to run the Scheduled Backup task under have log on as batch job, log on local, log on service permissions?
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LVL 12

Expert Comment

ID: 36523251
SBS Backup Task Scheduled Task

Expert Comment

ID: 36523836
<Marcustech> your correct I should pop to specsavers and learn to read properly.

LVL 12

Expert Comment

ID: 36525588
No worries Krypton, the amount of times I've skim read the question and dived in...

Accepted Solution

mtxit earned 0 total points
ID: 36579348
Thanks for the feedback, I've been off for a few days hence the late reply.

I have tried using an alternate account but get an authentication error on any account other than the domain admin.

I am looking at an error logged in the back up report regarding security and once this is done I'll try changing the credentials again
LVL 12

Expert Comment

ID: 36579420
mtxit, you shouldn't need to be changing credentials,  it should all be set up appropriately (under system account) when you run the wizard from the sbs management console.

Author Closing Comment

ID: 37061201
no solution found

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