2008 R2 - RD Gateway Server

I have a new setup of an RD Gateway & RD Web Access on the same server with multiple session hosts.

Everything works fine internally.

I am trying to publish externally and I keep getting the error that "The Remote Desktop Gateway is temporarily unavailable."  I have tried everything i can find on the net and nothing has worked.

I have port 443 pointed internally to the gateway/webaccess server.

Does anyone have any ideas on what to try next?
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considerscsAsked:
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bbaoIT ConsultantCommented:
first check this link to make sure Forms Authentication is enabled.

https://technet.microsoft.com/en-au/library/cc770330.aspx

then check below link to address the given error message.

http://www.chicagotech.net/remoteissues/remoteapp3.htm
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considerscsAuthor Commented:
I have seen those two links previously and just to be sure I went through them again.  All settings are correct as per those links.

I think it may be the SSL cert causing it.  We bought it from digicert but we are allowed 4 names on the UC cert.  So I have mail. , apps. , and autodiscover. on this certificate.  The primary name is mail.  Is this causing the issue perhaps?  Do I need to get a different cert for the remote apps?  I am servicing both Exchange and RDS with this cert.
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considerscsAuthor Commented:
anybody have any ideas on what to try?

I also get the following screenshot when I log in.  If i re-enter the web address, it goes past the error.
rdweb-error.png
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Hypercat (Deb)Commented:
So, what URL are you using to get to the gateway server, and is it using a different external IP address from the Exchange server?  I'm just wondering...if you've got port 443 forwarded to your Exchange server for OWA, you can't also have it redirected to the gateway server for the RDWeb connection, unless they're using two different external IP addresses.
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considerscsAuthor Commented:
Same external IP address, but different ports on the outside.

Apps is for the gateway and mail for the exchange server.
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considerscsAuthor Commented:
Ok, it definitely is not the cert.  We purchased a certificate with the common name of apps.  Still getting the error.

Any ideas where to start?
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considerscsAuthor Commented:
We already have port 443 tied up for exchange owa.  I used a diffferent port to forward in to 443 to the rd gateway server.  Everythign works for logging in and internally all is well.  Is this the issue that you cannot forwad a different port to the gateway server?

Also, I can use the gateway server from the outside to remote into any machine allowed behind it.  I just cannot launch remote apps.
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considerscsAuthor Commented:
it was the port.  It cannot be used on any other port but 443 from the outside with 2008 R2.
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considerscsAuthor Commented:
No one responded to the question and I was able to resolve myself with trial and error.  Posting the solution here for others to see if they run into the same issue.
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