title: Adding third DC to a domain - but the ADDS password is unkown
body: <p>I work for an MSP, We have a client that wants us to add a third DC to their production domain. We didn't build the domain. The previous admin gave us three or four different passwords to try.</p>
  <p>When I did this, I put the password in, the DC joined the domain as a computer, but was not listed as a DC. Running DCDIAG showed access errors on  some of the tests.</p>
  <p>I then powered off one of the existing DCs, and demoted the third DC, removed it from the domain.</p>
  <p>Is there anyway to non-destructively test the other passwords to see if they work. I am just afraid that I will screw something up with the adding and subsequent removal of a planned AD.</p>
  <p>I find it rather odd that the DCPROMO process completed with an incorrect password. One would think that that would be tested before anything else was done.</p>
  <p>Any help or ideas is greatly appreciated.
  Thank you.
  S</p>