Log Name: ApplicationSource: MSExchangeSetupDate: 2/14/2010 11:58:02 AMEvent ID: 1002Task Category: Microsoft Exchange SetupLevel: ErrorKeywords: ClassicUser: N/AComputer: HTCAS02Description:Exchange Server component Hub Transport Role failed. Error: Error:The following error was generated when "$error.Clear(); set-ExchangeServerRole -Identity $RoleFqdnOrName -IsHubTransportServer:$true -DomainController $RoleDomainController" was run: "The domain is invalid. Property Name: Domain".

Please follow up on your thred which has the same query http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/d8bda636-c767-45f1-a231-b1e83729bc5cRaj