cannot access OWA outside of the network

I can access OWA from inside the network using https://"email server name"l/exchange/ but outside of the network using https://"email server name"/"DC server name.com"/exchange/ I get the prompt for a user name and password but it will not authenticate.
CograndeAsked:
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leegclystvaleCommented:
Have you opened port 443 and 80 and pointed these to your exchange server?
Also ensure you use domainname\username and password
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leegclystvaleCommented:
Port 80 shouldn't be necessary :o)
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edmund7sCommented:
Do you have ISA server or a hardware firewall?
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CograndeAuthor Commented:
Yes we have a Cisco firewall which I am looking into now, I also am not sure what the correct URL should be when connecting outside of the network.
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edmund7sCommented:
you need to forward port 443 like leegclystvale said...

open firewall
access-list firewall permit tcp any host [ip address of external pix interface] eq 443
static (inside,outside) [ip address of external pix interface] xxx.xxx.xxx.xx netmask 255.255.255.255 443 443
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edmund7sCommented:
Once you open port 443 you should be able to access https://"email server name"/exchange/

And as far as you correct URL you need to check with your DNS provider...check your CNAME

or if you have not already create an easy name like webmail.domain.com that points to https://"email server name"l/exchange/
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CograndeAuthor Commented:
Port 443 did  it, thanks.
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leegclystvaleCommented:
The old port 443 problem hey? :o) Glad you're sorted
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