Basic checklist

connections limited incorrect environment internal error has occurred invalid hardware key stops working

In case XP/VS Server is not working after installation please go through this basic checklist.


Check if the license is valid in the XP/VS Terminal Server Administrator.

Licensing specific articles can be found here.

Windows updates

Did you install Microsoft Updates recently? If you get a pop-up-message from “Thinstuff XV/PS Server” telling you that your installed version is not compatible (“incompatible environment”) - please download and update the XP/VS Server version.

As usual you can obtain the latest version from here.

Server attacked?

Do you get the error message

  • “Number of connections to this computer is limited…”
  • or in Windows 7 “Internal error has occurred” Open Command Prompt (cmd.exe) with administrator rights and enter command “netstat -a” Check which / how many connections are listed for the RDP port (per default port number 3389) If some unknown IPs are listed ensure that these are from your region or from any foreign country

Check location here:

If you get any suspicion that this port is misused - you can change the RDP Listen Port (short time solution).

Internal connection test

  1. You can test RDP connection first on the computer running XPVS Server
  2. Open on this machine mstsc.exe (Remote Desktop Connection) and enter IP address “” start remote connection from/ to the server (loop-back), enter remote user credentials, connect.

Does it work or do you get an error message ?

Alternative Terminal Server software installed ?

Did you use an alternative software to enable remote access for multiple connections ? Please note - some of these programs might use hacked system files. XP/VS Server only supports original Microsoft Windows files, if there is any conflict - the service cannot be started.

Corrupt system files

Enter command “sfc /SCANNOW” –> please send a screenshot of the result

CCleaner, RegCleaner

Did Thinstuff XP/VS Server was running for a while and “suddenly” stops working ?

Might be caused by software products like RegCleaner, CCleaner. This application should be used wisely, otherwise it causes problems, as it can damage installation paths, etc.

Upload TSRP

All checks done - not any idea why the software is not running ?

Right in the moment when this error occurs - Important !!! Otherwise we will not get a helpful hint - please create and upload our diagnostic file TSRP (Thinstuff Support Request Package).

Most of the time this is the fastest and most simple way to analyse 90% of possible server-side configuration problems and errors. Please run C:\Program Files\Thinstuff\XPVS Server\TSSupportPackage.exe and follow the instructions to upload an error report.

This will take literally just 2 minutes of your time and we’ll hopefully immediately see what the issue is.

Related articles

  • Quick-start guide

    Please go through the following Quick-Start guide after you have installed XP/VS Server.

  • Remote Desktop Software

    Official partners