RD Web Access From The Internet/External

I’m requesting help with accessing from the internet (external web) a RD Web Access Connection (SSL) that I setup and configured on a Windows 2008 R2 Server.
My setup is as follows. All server rolls are configured and running on one Windows 2008 R2 Server (VM).
1.
Remote Desktop Services
a.
RemoteApp Manager
b.
Remote Desktop Connection Manager
c.
RD Gateway Manager
d.
RD Session Host Configuration
e.
Remote Desktop Service Manager
f.
Remote Desktop Licensing
2.
Web Server (IIS)
All my configurations are working perfectly internal/intranet. I can access all published applications and remote desktop connectivity via (SSL) from IE 9 web browser.
The URL that is used internally is: (https://ServerName/RDWEB).
When I attempt to connect via the internet I’m getting an “Internet Explorer cannot display the webpage” message.
I’m using Dynamic DNS to access the server hosting the (IIS Remote Access Web Page URL), example (https://DDNS/RDWEB). I’ve opened ports 443 & 80
on my Untangle firewall, also port forwarding for 3389.
Any and all help will be appreciated.

Freek,
Thank you for your response. I tested Telnet as you suggested, and both FQDN and IP address were able to establish a Telnet connection to my RD Web Access Server.
The “NSLOOKUP” resolved the DNS server name. Also, I am able to us the IP address, URL (https://IP/REWEB) in IE9 to browse to my RD Web Access Server site. The above should confirm DNS IS working correctly within my internal network.
My connection issue is from external/internet access to my RD Web Access Server site. All my networked devices (internal) are natted IP assigned behind an “Untangle
Gateway” firewall and routable internally only.
Although, I’ve opened ports, created firewall rules to pass traffic on ports 443, 3389 my problem still exist. Since my internal natted devices are not routable
from the internet, I am using a DDNS host URL from (www.dyndns.org) to route from the internet to my internal site server. As it stands now, I suspect the problem maybe at the Untangle Gateway”. I will focus my attention there.
Thank you again for your help.
Aubrey R. Martin

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