Need help getting nameservers to work on a domain with SBS2011 and Server 2008

I have purchased a domain that I need to point to an internal server. Currently I am able to access the server via a public IP address but not the domain. Our environment consists of and SBS2011 server that does all dhcp for our network and a separate MS Server 2008 server that hosts an e-commerce site.

Here is what I have done so far:

1) pointed my domain at the two nameservers I have created on the SBS2011 server. (ns1.mydomain.com and ns2.mydomain.com)

2) created a host record that uses the internal IP address of our application server.

3) created a host record on the application server that uses the external ip address of the application server.

What's happening is that I am able to correctly get the application server to work inside of our network by going to the domain url but I cannot get it to work outside of the network (I get a server not found as well as timeouts when I ping or do an nslookup on the url).
group_imagingAsked:
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Darius GhassemCommented:
Did you create an A record on the internet DNS server that holds your records? Or your domain's records?
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group_imagingAuthor Commented:
By internet DNS server are you meaning the domain registrar? If so, I have added hosts that point to my application server's external ip address.
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Darius GhassemCommented:
You have added A records that point to the external application server's IP address? On your domain registrar  you have these records?
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group_imagingAuthor Commented:
Yes, the A record on my registrar is pointed at the exteral IP address for my application server.
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Darius GhassemCommented:
can you ping this IP address externally?

Can you ping the name of the domain?

If you can ping the IP address but can't ping the name make sure you have DNS setup properly. Wait a while see if DNS replication is taking sometime to replicate
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group_imagingAuthor Commented:
Ah, I think I found the problem. There was a nameserver that had a typo entered on my registrar side that was causing it to fail.
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Windows Server 2008

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