Windows server 2012 remote desktop service setujp

hi, I have installed windows server 2012 with remote desktop service, it seems every thing is OK on local network, but for our branch office user on USA, the server use VPN connect together, and they went through remote desktop login to this server to run the program
they seems had problem use RD web access, but no issue on open remote desktop to connect to server and run the program, when I click the program on the website I published, it will ask me the login user name and password, then will pop up a message said my gateway address is incorrect.

and I test my local web access, it didn't have any issue.
my server address gateway is different the brantch office's gateway,  one is : and brantch is :, so maybe this is problem? how can I fix that?

Simon ChenNetwork AdministratorAsked:
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Simon ChenNetwork AdministratorAuthor Commented:
is any one can help?
Rodney BarnhardtServer AdministratorCommented:
There is a screen shot in the link below that may address your problem. It involves going into they website settings and configuring the gateway under the "Application Settings"

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Windows Server 2012

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