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Remote Desktop to Windows 8

I have 3 computers running windows 8,  (A1, A2, A3) all set up the same.
I am running an adtran firewall with vpn and netextender. I can remote desktop into each computer in the office.  From the outside, I tested each computer and could connect. Then I set up the users to access their computers from home. Some times they work, sometimes not.  When they fail a connection,  the message is almost instant. REMOTE DESKTOP can't connect to the remote computer for one of the reasons, 1 Remote access to the server is not enabled 2) The remote computer is turned off 3) The remote computer is not available on the network.  
At this point, I go to a different computer, like my wife's computer, turn on net extender and remote desktop into the computer that failed connection.
The VPN is working, and net extender is working because I am able to establish a connection to the remote network. The computers are working because I can log into them from different external computers.  Once a connection fails on a computer, it will never connect.   Sometimes, removing the user name on the remote desktop connection program option will allow me to log on. I have windows 8 on the wife's laptop, windows 7 on my home desktop, and windows 8 on the internal computers. The main server is 2012.
Any ideas why Remote Desktop will not accept a connection, when it previously has?
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jetwcs
Asked:
jetwcs
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2 Solutions
 
McKnifeCommented:
Hi.

For a simple diagnostic step, check if you can reach port 3389 at the cliennt (which is used by RDP). The command to check would be
telnet targetcomputer 3389
telnet.exe needs to be installed as a windows feature, first.
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jetwcsAuthor Commented:
Thank you.  I will try that tonight and post what ever happens.  One point is this, I have 3 computers set up for remote access, and can access each one with rdp, from the office lan, and from computers externally.  I have been able to RDP to each one from my windows 7 home computer or my windows 8 laptop.  After initially using RDP on each computer, they are very particular to allow me, or anyone else to gain access a second time.
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jetwcsAuthor Commented:
The problem was windows 8 changing a static IP address to Dynamic on each reboot.   Added  reservations for the remote desktop targets to static IP address and they now work, except The second compounding issue was Windows 8 client version 4.##.## does not work.  I need an upgraded net extender. V6.0.181.  Does anyone have a link to download this version?  ADTRAN and SONIC wall do not publish it anywhere I can find safely.
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jetwcsAuthor Commented:
adtran support can email you a copy of the latest net extender, and some time after June 1, 2013 they will have it in their firmware, It is a Windows 8 issue. The other issue is windows 8 on a domain server need a reservation entered for static IP address in the DNS.
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jetwcsAuthor Commented:
This was a problem in net extender and windows 8
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jetwcsAuthor Commented:
adtran support can email you a copy of the latest net extender, and some time after June 1, 2013 they will have it in their firmware.
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