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Exchange 2010 and aditional Active Directory sub-domain/child domain

We had Active Directory domain called DOMAIN.LOCAL. There was Exchange 2010 installed. It was fully functional. After some time I added new sub-domain/child domain SUB.DOMAIN.LOCAL and migrated users with mailboxes from DOMAIN.LOCAL to SUB.DOMAIN.LOCAL.


When users from SUB.DOMAIN.LOCAL logged into OWA they received following view:

OWA Error

Error stated: Exception message: Could not find any available Domain Controller in domain DC … so problem is probably in the way Exchange locates domain controllers. When users clicked F5 or refreshed website, he could see his e-mails normally.

There was also event 2130 logged on Exchange server saying Exchange Active Directory Provider could not find an available domain controller in the domain.


When you want to install Exchange into Active Directory domain, you need to prepare forest and also domain before you install it. You use setup.com (from installation DVD of Exchange) with some switches (for example /PrepareSchema, /PrepareAD,…). So new added domain SUB.DOMAIN.LOCAL to existing AD Forest was not prepared for Exchange implementation. I ran following command setup.com /PrepareDomain:SUB.DOMAIN.LOCAL:


If you have more then one domain to prepare for Exchange, you can use command setup.com /PrepareAllDomains.

The best way to run /PrepareDomain or /PrepareAllDomains is:

  • to be logged domain controller with role Schema Admin
  • to be member of Enterprise Admins group
  • to be member of Schema Admins group

I hope you will not make same mistake as I did 🙂


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