Exchange Server 2013 install problem

Question

I am currently trying to install our first Exchange 2013 mailbox in a child domain. This will coexist with Exchange 2010. I have run the prepare schema/AD and /preparealldomains in the root domain. I have checked the various ADSI attributes to check that
the updates have completed and I can see no replication issues.
All of the existing Exchange 2010 servers have SP3 and update roll up 5 installed apart from 1 mailbox server that is just SP3.
I am trying to install Exchange 2013 on Server 2012 r2 with all available updates.
The problem i am having is every time i run the Exchange 2013 setup choosing the mailbox role to install the prerequisite analysis fails stating "Local domain needs to be prepared" and points to an article on how to run the setup /preparedomain
that i have already done.
Can anyone offer any insight in to what setup is checking for, what might be causing this and how to get past it?
Thanks

Answer 1

Hi all, I had already tried to force replication and not seen any problems, The accounts I am using have the correct permissions, as Bruce says you can't /prepareschema on a child domain this has to be done in the domain where the Schema Master is.
I have also already run the /preparedomain in the child Domain and it has made no difference. 
I have checked and confirmed the ADSI attributes in this Technet article
https://technet.microsoft.com/en-us/library/bb125224%28v=exchg.150%29.aspx
The exchange setup logs are not really giving me anything to work with. Each time i run the setup i see an error on in the event viewer of the server i run in on as follows :
View Entire Forest: 'True', Configuration Domain Controller: 'Domain Controller', Preferred Global Catalog: 'Domain Controller', Preferred Domain Controllers: '{ Domain Controller }'
Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException: The operation couldn't be performed because object 'Server' couldn't be found on 'Domain Controller'
Not sure if this is points to anything? I can obviously find the server object in the referenced Domain Controller.
I am also seeing this in the application log each time i run the setup.
ExSetupUI.exe
2892
Get Servers for ROOT DOMAIN
TopologyClientTcpEndpoint (localhost)
3
System.ServiceModel.EndpointNotFoundException: Could not connect to net.tcp://localhost:890/Microsoft.Exchange.Directory.TopologyService. The connection attempt lasted for a time span of 00:00:02.0157024. TCP error code 10061: No connection could be made because
the target machine actively refused it 127.0.0.1:890.  ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:890