Remote Web & OWA - Windows SBS 2008

Remote Web & OWA has been working fine for over 3 months.

Suddenly today when I try to acess https://mail.dentalserve.net/owa or https://mail.dentalserve.net/owa. ExternallyI receive a message "Internet Explorer Cannot display the webpage"

However internally on the network I am able to successfully access https://mail.dentalserve.net/owa or https://mail.dentalserve.net/owa.

How has this problem occured out of the blue ? How can it be fixed ?

Thanks

Dall
BhanaD2Asked:
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BhanaD2Author Commented:
Problem was resolved the domain provider added an additional MX record fro some reason.
I asked the provider to remove the additional MX record, this resolved the problem.

Regards

Dal
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Kruger_monkeyCommented:
What have you got between internal and external?  Router with port forwards?  Direct access ?  firewall ? etc.

Sounds like your pointer to the exchange server may be broken.  If you have a port re-direct then verify it is still in place.  Check firewalls etc.

Has any equipment/settings/software changed recently?  Specifically WAN/LAN equipment or security software on the exchange server?
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BhanaD2Author Commented:
I have a netgear Prosafe DGFV338 VPN ADSL Router. Firewalled

Inbound Ports 443, 80 and 987 are already opned and directed to the server IP.
No equipment has been changed
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Kruger_monkeyCommented:
I have just tested and clicking on your https://mail.dentalserve.net/owa link I get presented with an OWA login page.  Whatever teh problem was seems to have resolved, has your router been restarted since the problem?  It may just have been a router issue.  If it was working internally but not externally the problem is normally DNS, port redirection or internet access.

dentalserver.JPG
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