Can't access Exchange 2007 OWA externally

I'm deploying a new Exchange 2007 server (no existing exchange) on a windows 2008 server and I'm having trouble accessing OWA externally.  It works fine internally but when I try from the outside I get prompted for my credentials and then it takes me to a page could not be displayed.  

Any ideas?
shanna1017Asked:
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Michael WorshamConnect With a Mentor Infrastructure / Solutions ArchitectCommented:
Is the Exchange 2007 site using a self-signed certificate or a certified one?

How to Obtain a Server Certificate from a Certification Authority
http://technet.microsoft.com/en-us/library/bb125165(EXCHG.80).aspx

EE PAQ'd Solution:
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23593360.html
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shanna1017Author Commented:
for right now (while i'm testing) i was just using the default one.  Shouldn't that still work?
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Exchange_GeekConnect With a Mentor Commented:
A self-signed certificate wont work from internet. You need to get a third-party certificate.
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shanna1017Author Commented:
DOH!  OK, i thought it would just give the error saying the cert isn't valid.  

Thanks.
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