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Your credentials did not work

Last Modified: 2016-04-27
  I have SBS2011 network and within that, I have Windows 2008 Terminal Server "TS1". Internal network users connect to TS1 using remote desktop connection program from their workstation PC without a problem.
  However when I tried to connect to TS1 from outside of the network, it fails with the message "Your credentials did not work" when even using domain admin account. When I click [Connect] button on RDP, it prompts for the password, but when I enter a correct password, it fails.
 So the problem is not related to user account credentials. There must be something more internal or systematic and I don't know where to begin looking.
 On the remote computer, I installed SBS2011 self-generated certificate downloaded from \Public\Download folder.
 Below is my remote desktop settings:
 (1) Computer: TS1
 (2) Username: domain\domain_admin  ( I also used domain\user_name)
 (3) Advanced tab\Settings\Use these RD Gateway server settings:
       Server name: remote.domain_name.com
      Logon method: Allow me to select later
  [x] Bypass RD Gateway server for local address.

The settings above is same settings that I use for all other SBS2011 networks that I manage and they always work except this network.

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