Unable to join domain controller on EC2

Hi,I am hoping someone can assist me please.  

I setup windows 2008 server EC2 (Free Version Tier 1) for testing purpose before i go ahead and upgrade. I am having issue adding my vmware to the domain controller in AWS EC2. The vmware machine has internet connectivity. When I tried adding the vmware to the domain controller (using the CNAME point to the AWS public ip address) I am not having any luck, looks like it's dns issue.

Active directory has been successfully installed including the DNS service on AWS EC2, The primary DNS on the LAN  is pointing to the primary private ip address of the server. From EC2 Security, I have allowed ICMP, DNS. I have also setup CNAME from my domain to the public address of the AWS EC2 machine. Note: I have not purchased elastic ip address yet, so i tried testing this while the instance is running.

I am able to ping the AWS domain controller public ip address using the CNAME which I had created.  I have tried to point the dns server on the vmware to the public address off the aws machine and tried adding the vm machine to the dc with no luck.

Any advise please?
Indulge_209Asked:
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Zephyr ICTCloud ArchitectCommented:
Well, first off, setting up a DC on a public address is not really a good idea, Amazon has better solutions for that (e.g VPC - Virtual Private Cloud)... Besides that Amazon also has "templates" that will configure the complete AD for you, this is called Cloudformation

That being said, I understand you wish to try things first, see if it works, and keeping costs low, you might benefit from the official AWS documentation concerning Active Directory on EC2, this can be found here... Though it's not that extensive

It will be some work because you need to adjust/configure a lot of security groups/ports, not only DNS/ICMP, you'll need ports for AD, Kerberos, LDAP(S), GC, IPSEC maybe ... etc ...

Then you might test by seeing if you can connect to the LDAP server before trying to connect with some application...

Still, it would be a better idea to have a VPC maybe with a direct VPN connection to your office, I don't know what your budget is of course, or what the use will be ...

I'm not saying it's not possible to use EC2 ... I'm just not convinced it's a good idea
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Indulge_209Author Commented:
Thanks
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