Hi, I face a problem in the Readiness Check phase while installing Typical exchange 2010 in child domain "Farms.XXX.com", I have Typical installation of exchange 2010 in "xxx.com" parent domain and DNS resolve from one domain to the other is fine Error: Setup encountered a problem while validating the state of Active Directory: No domain controllers for the domain FARMS and the site XXX are available. Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.2.247.1&e=ms.exch.err.Ex28883C&l=0&cl=cp

Make Sure Nslookup seeing a Domain Controller Also Verify nltest /dsgetsite - Seeing the Correct Site Also Verify Remote Registry Service is running

Setup encountered a problem while validating the state of Active Directory: No domain controllers for the domain FARMS and the site XXX are available. Hi Ahmad, In each Active Directory site where you plan to install Exchange 2010, you must have at least one global catalog server and one writeable domain controller. Please make sure you meet the Exchange 2010 System Requirements first: http://technet.microsoft.com/en-us/library/aa996719.aspx Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.Frank Wang TechNet Community Support