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What happens to my child domain when I get disconnected from the Forest Root?

I need a general answer here for this one.  I have been told to become a child domain of Forest Root domain "WHY.com".  I am "WHY.ME.com"  I am running Server 2003 SP1 which sets the default Tombstone Service Live (TSL) at 180 days.  Two questions arise from this:

1. Once my connection to WHY.com is reestablished, as long as it is withing my TSL deadline, is there anything I need to do, or should it automatically connect and begin replicating again?

2. Once my connection to WHY.com is lost (temporarily), how does my domain act generally in terms of performance?  Is it functional, yet slow, because it is constantly searching for WHY.com?  Or will it leave me too crippled to sufficiently function.

To answer a few questions, my domain is for local authentication, file & print share.  WHY.com domain is also used for authentication, but additionally houses the Exchange server.

Any ideas how this will / will not work?
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Top Expert 2012

Commented:
First thing you should install SP2 this fixes multiple issues with Windows 2003 server.

1. Once my connection to WHY.com is reestablished, as long as it is withing my TSL deadline, is there anything I need to do, or should it automatically connect and begin replicating again?

Once the connection is back up the system should start replicating again. I would check to make sure it is replicating though.

2. Once my connection to WHY.com is lost (temporarily), how does my domain act generally in terms of performance?  Is it functional, yet slow, because it is constantly searching for WHY.com?  Or will it leave me too crippled to sufficiently function.

Do you have domain controllers on site for the child domain? If you lose Exchange you will lose email and can see some slowness in Outlook. If you have DNS servers and DCs on site that are global catalog should not see many issues since you child domain runs most of it own network infrastructure services.

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Commented:
Dariusg, yes, I have a local DC running DNS on my domain (thought that was mandatory anyway) but I forgot about making it a GC, which should help things.  Thanks for that.

Question about the FSMO roles.  They will reside on the parent WHY.com domain.  Without those roles (during the disconnect), how will that affect my local child domain?
Top Expert 2012
Commented: