Windows 7 Remote Desktop port 3389 Stopped Working

Recently we had remote desktop stop working on a few of our clients Windows 7 Pro machines. After patching together some resolutions, we have come up with a surefire way to remedy the problem.

  • Uninstall update(s) KB2621440 and/or KB2667402
  • Reboot
  • Run sfc /scannow from a command prompt to check for file corruption
  • Reboot if necessary
  • Verify that rdpcorekmts.dll exists and is atleast version 6.1.7601.xxxx (if it is not then copy it over from a working machine)
  • Export this registry key from a working machine and import it into the broken machine HKEY_CLASSES_ROOTCLSID{18b726bb-6fe6-4fb9-9276-ed57ce7c7cb2}
  • Reboot
  • Then, export these registry keys from a working machine and import it into the broken machine HKLMSYSTEMCurrentControlSetControlVideo{DEB039CC-B704-4F53-B43E-9DD4432FA2E9} and HKLMSYSTEMCurrentControlSetservicesRDPDD
  • Reboot
  • Test Remote Desktop to see if it is working. If it is, then the problem is fixed. If it is not, continue with the following steps
  • Check for and register the following .dlls in C:windowssystem32: rdpcore.dll, rdpcorekmts.dll, and remotepg.dll (in command prompt: regsrv32 rdpcore.dll) (replace any missing .dlls in the directory)
  • Reboot again
  • The problem should now be resolved and you should be able to reinstall the update/updates

Our Network Team is happy to help you with any troubleshooting problem, big or small. Call us today!