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jontyplattFlag for United Kingdom of Great Britain and Northern Ireland

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Redundancy for Domain on Server2003

I have two domain controllers, both with AD on them. recently the power supply failed in the main domain controller. I assumed that I could enable the DCHP on the other controler and everything would be ok. however I was unable to log onto the second server as it could not authenticae my logon. If I logged on locally I could not activate the DHCP, as I didn't have enough permissions.
I got over the problem by finding a new power supply for the primary domain controller, but I want to make sure that if I loose the main server again I can switch to the other on.

What am I doing wrong?

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Yes - DHCP is another issue, beacuse I only have 254 addresses and I only have about 40 free. In addition I have about 30 static IP addresses (WAP and Printers, IP Phone system etc). I have considered rescoping or using a SuperScope, but really this ought to be the suject for another question.

Thinking back I now remember that I was not able to log ontot he second server locally, and I am sure that I have the DNS and AD running on both machines - I remember checking that the users sere on both and when I added to one it was automatically added to teh other.

Basically I am going to start again with a cheap box and add 2003 to it and then follow the instructions about. I might also move my DHCP reservations across using the DHCP mdb files and check it all runs.

Is this a good idea?
As mentioned above please check your second DC is a global catalog or not.

Importanat note:
Best practice,not to install Infrastructure Master (IM) role on the same domain controller as the Global Catalog server (.i.e.Primary DC). If the Infrastructure Master runs on a GC server it will stop updating object information because it does not contain any references to objects that it does not hold. This is because a GC server holds a partial replica of every object in the forest.
In response to @abbasiftt's comment

Having the Infrastructure Master on the same machine as the Global Catalog is only an issue in a multi-domain environment where not all machines are Global catalogs - if you don't have multiple domains it not an issue. If you do have multiple domains and all yor machines are GCs, then again ita NOT an issue