access exchange 2010 owa web application using dyndns host name

I need to publish my exchange 2010 owa using dyndns host name. I am using ADSL internet router. I have configured my router with dyndns host name I need users to access my exchange server from outside using the url How can I config this. When I type the I got the http 404 file not found error.Any step by step guide with picture available for this.
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jobby1Connect With a Mentor Author Commented:
It is ok now after I did the port fw in the adsl router
Evan CutlerVolunteer Chief Information OfficerCommented:
try  also try
Exchange likes using subdomains as well.

if this isn't the case, check your IIS/apache.  if is working and you can get to owa via inside the network, then your primary webserver is not pushing.  
jobby1Author Commented:
inside it is working fine.I can access using localhost/owa. I tried
 no use. Any seeting to be done in exchange.
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Evan CutlerVolunteer Chief Information OfficerCommented:
ok...what webserver are you using?  IIS?  
is exchange physically on localhost? or on another machine?

jobby1Author Commented:
on localhost.Yes IIS default coming with exchange 2010
Evan CutlerVolunteer Chief Information OfficerCommented:
sorry...what I mean is this.

When someone goes to your normal website, it goes to an IIS your router is told to send traffic to and from.  Is your website on the same machine as your exchange server?

meaning: is on Machine 1, and is on machine 2....

Now if and are on both machines, then you have an IIS problem, and  you need to go check your subdomains and ports.  If IIS thinks owa is on port 81, then that's why you are not seeing it from outside the network.
jobby1Author Commented:
After i did the port fw it is working fine

How CNAME record should look like if the external owa is,
and dyndns is: ???

mail          CNAME        (and here is my question - destiantion should be ???

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