When I try to install Exchanger server 2007, I get the below error; Hub Transport Role Prerequisites Failed Error: Active Directory does not exist or cannot be contacted. Recommended Action: http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.3&id=51e5500d-8b18-4eee-bb8e-925d063b60a1 Error: You must be a member of the 'Exchange Organization Administrators' or 'Enterprise Administrators' group to continue. Recommended Action: http://go.microsoft.com/fwlink/?linkid=30939&l=en&v=ExBPA.3&id=1d750594-9222-44d7-8f80-45e522e889e6 Error: Setup encountered a problem while validating the state of Active Directory: Domain xyz.abc.com cannot be contacted or does not exist. Warning: Setup cannot verify that the 'Host' (A) record for this computer exists within the DNS database on server xx.xxx.xxx.xx. ------------------------------------------------------------------------------------------ Note: The server is already a part of 'Enterprise Administrators' group Please advise on how to fix this issue.

Hi Birobrata deb, Can you resolve the name of the server in wich you try to install exchange? Try the following command in command prompt: nslookup servername Please, post de groups that your user belongs to. Regards Rafael

Hello Check the DNS configuration and also disable any firewall or Anti Virus running on exchange server as well as Domain controller. run the Dcdiag on the server. Thanks Mhussain

Hi Birobrata, Any updates on this issue? Please make sure the DNS configuration is right, and your Exchange Server can connect to the DC well. Form the error description, I suggest you follow these steps to troubleshoot the problem: 1. Make sure you have add the ‘Host’(A) record for your Exchange Server. 2. If the logged-on user don’t have permission to run Exchange 2007 setup, grant the logged-on user Enterprise Administrator or Exchange Organization Administrator permissions, or log on with an account that has those permissions and rerun Exchange 2007 setup. 3. Use NETDIAG.exe and DCDIAG.exe to further diagnose the problem . 4. Check the setting of firewall and Anti-virus software on your Exchange Server and Domain controller. Here are some related articles for you, hope it helps: Active Directory does not exist or cannot be contacted http://technet.microsoft.com/en-us/library/aa996541(EXCHG.80).aspx Configuring DNS Settings for Exchange 2007 Servers http://technet.microsoft.com/en-us/library/bb124896(EXCHG.80).aspx Add a host (A) resource record to a zone http://technet.microsoft.com/en-us/library/cc779029(WS.10).aspx Domain Controller Diagnostics Tool (dcdiag.exe) http://technet.microsoft.com/en-us/library/cc776854(WS.10).aspx If the problem still exists, please feel free to let me know. Best Regards, Evan