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Exchange 2010: Cannot connect to Outlook Web Access

No user cannot connect to Outlook Web Access from an external location using any type of browser. All updates have been applied to the server.  Using the Outlook client works just fine - internally and using our VPN.  Exchange 2010 is installed on Windows Server 2008 R2 SP1. Ports 25 & 443 are open on the Cisco ASA 5510 Firewall.  
1 Solution
My first test I would do is run a telnet command to the external address and see if the port is open.

telnet www.yourdomain.com 443

If the telnet port changes to a cursor instead rejection message, then you know at least the client access server is listening on that port.

I assume you said OWA works internally. If so, then you know the server has the firewall ports open for Windows.
Suliman Abu KharroubIT Consultant Commented:
what is the exact error you get ? can you use owa internally ? if so, check you cisco firewall config...
Have you added your Webmail Address in the external DNS?

For ex: internally you are accessing Exchange WebApp using https://webapp.yourdomainname.com/owa then webapp.domainname.com should be resolving from outside for the link to work. I'm not sure you have done this step.
You may need to do any entry to the Public IP(natted IP) of your CAS server in the Public DNS server and wait until it replicates.

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