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Connectivity to the remote computer could not be established

When you try to "Connect to Client Desktops" using Remote Web Workplace, you may get the following error:

Connectivity to the remote computer could not be established. Ensure that the remote computer is on and connected to the Windows Small Business Server network.

There are a few steps you can try, in order:

  1. Make sure that you can connect to the computer from another computer on the internal network using mstsc
  2. Check the router configuration - ensure that port 4125 is forwarded to the internal IP address of SBS
  3. Check that another process is not listening on port 4125. The most common process is mad.exe - check by running netstat -aon | find ":4125" and then going into Task Manager to check the PID. If it is mad.exe you can restart the "Microsoft Exchange System Attendant" service. See KB886209 for more information and how to prevent this from happening again
  4. Make sure you've installed the security certificate into "Trusted Root Certification Authorities" and that you don't get any certificate warnings in Internet Explorer
  5. Add the site to "Trusted Sites"
  6. Reset all Internet Explorer settings to default (security, zones, etc.)

The problem may be to do with the Active X control, especially if you have just installed Windows XP SP3.

  1. Reregister the Mstscax.dll file. To do this, click Start, click Run, type regsvr32 %systemroot%\system32\mstscax.dll
  2. Go to Tools > Internet Options > Security tab > Custom Level, scroll down to Active X Controls section and change all to "Prompt". If Prompt is not an option use "Enable"
  3. Go to Tools > Internet Options > Programs > Manage add-ons and search for the "Microsoft Terminal Services Client Control ActiveX control" or for the "Microsoft RDP client Control ActiveX control" and set it to Enabled. If you can't see the add-on, try going to another RWW which is working and install it from there...
  4. Delete the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX  Compatibility\{7584C670-2274-4EFB-B00B-D6AABA6D3850

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