How to re-join domain, with no local administrator enabled

Hi,

In a domain, all pc´s have disabled the local administrator account - and default users have no admin rights. (well, safe and fine)
But if then suddenly at logon the message : The trust relationship between this workstation and the primary domain failed

So - normally in old XP days a rejoin of the domain would fix it with a local admin account. But how to do this now ? Is there a way to create a local admin account so there can be logged in

By the way - the PC is running bitlocker, and bitlocker code for the computer can not be found, as the domain don´t see the pc anybore

So any suggestions please ?
dvbguy1Asked:
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McKnifeCommented:
The solution is always to offline-enable the local admin account. This can be done only if the hard drive is accessible, that means after unlocking bitlocker. Simple steps:
1 boot win7/8.x setup
2 press shift F10 to get a command line
3 manage-bde -unlock c: -pw (please note that pw stands for password, which will not be present for win7 - here you will need -rk (recovery key), also, the drive letter (here c:) needs to be adapted)
4 rename c:\windows\system32\utilman.exe to utilman.bak and copy cmd.exe to utilman.exe (in the same directory)
5 reboot, press ctrl shift del and then click on the utilman symbol (lower left) - a command line will appear with system rights
6 use the command "net user administrator /active newpassword"
7 logon as administrator with newpassword
8 disjoin/rejoin domain
9 undo your utilman changes and disable the local admin again.

Proven solution.

But: since you deleted the computer object, it seems you don't have the bitlocker recovery key... how does the hard drive boot, what protector is used, tpm only?
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KimputerCommented:
If a domain admin has logged on before, you can disconnect LAN, and reboot. You will still be able to login with the domain admin account.
If not, the Bitlocker is blocking the conventional methods (enable admin through boot cd), and I'm out of ideas.
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dvbguy1Author Commented:
Admin newer login on computers - so there are nothing cached.
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Miguel Angel Perez MuñozCommented:
You can try restore secure channel from powershell, but must be run as administrator:
Test-ComputerSecureChannel –Server *dc name* -Repair -Verbose
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dvbguy1Author Commented:
Local administrator disabled
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Miguel Angel Perez MuñozCommented:
Try right click, run as administrator ;)
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dvbguy1Author Commented:
yes it ask for credentials - but what to enter ?. administrator is disabled, and domain admin can also not be used, as the domain is not connected on the pc
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dvbguy1Author Commented:
Yes - TPM
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McKnifeCommented:
Ok, TPM only without a PIN? That's bad for you.
If you don't have the recovery key and (what you should have done) no second backup but AD existed, then there are only 3 ways left:
-replay a backup (if existent) - it will be replayed unencrypted and everything will be good
-do a so-called "cold boot attack" on your tpm (youtube tells you what that is, it's somewhere next to what James Bond would do)
-if the system is not patched to the max and no firewall is active try to exploit its services via network to get access (that's experts'/pentesters' work)
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McKnifeCommented:
Ah, wait, years Active directory has introduced a recycle bin for objects, so you can maybe revive that computer object and with it, the Bitlocker recovery key. Has recycle bin been setup?
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dvbguy1Author Commented:
hi,
You wrote
1 boot win7/8.x setup

with that you mean, to boot on windows 7 installation disc or ?
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McKnifeCommented:
Correct.
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McKnifeCommented:
Could you unlock it? How did you end up?
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