It sounds like you're encountering an issue with RemoteApp on Windows. This error typically occurs when the RemoteApp program you're trying to start isn't listed in the authorized programs on the server. Here are a few steps you can take to resolve this issue:
Check the Authorized Programs List:
- Ensure that the RemoteApp program is included in the list of authorized programs on the server. You can do this by checking the RemoteApp Manager or the relevant settings in your Remote Desktop Services configuration. Registry Settings:
- You might need to modify the registry settings. Specifically, check the `TSAppAllowList` key in the registry:
- Navigate to `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\TSAppAllowList`.
- Find the key `fDisabledAllowList` and set its value to `1`[[1]](https://techcommunity.microsoft.com/discussions/azurevirtualdesktopforum/windows-cannot-start-the-remote-app-program/1518617).
**Group Policy Settings**:
- Ensure that there are no Group Policy settings restricting the applications that can be run. You can check this in the Group Policy Management Console under `Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> RemoteApp and Desktop Connections`.
**Port Configuration**:
- Make sure that the RDS servers are listening on the correct ports. Sometimes, the RemoteApp might try to run from the connection broker instead of the session host if the servers are not listening on the required ports[[2]](https://community.spiceworks.com/t/windows-cannot-start-the-remoteapp-program/600848).
**Restart Session Hosts**:
- If the issue persists, restarting the session hosts might help, although this is not always practical if other users are connected[[1]](https://techcommunity.microsoft.com/discussions/azurevirtualdesktopforum/windows-cannot-start-the-remote-app-program/1518617).
```If you continue to experience issues, it might be helpful to consult with your system administrator or refer to more detailed troubleshooting guides available online.
Let me know if you need further assistance!
References
[1] [Windows cannot start the remote app program | Microsoft Community Hub](https://techcommunity.microsoft.com/discussions/azurevirtualdesktopforum/windows-cannot-start-the-remote-app-program/1518617)
[2] [Windows cannot start the RemoteApp program. - Spiceworks Community](https://community.spiceworks.com/t/windows-cannot-start-the-remoteapp-program/600848)
[3] [The following RemoteApp program is not in the list of authorized ...](https://sbsfaq.com/the-following-remoteapp-program-is-not-in-the-list-of-authorized-programs-on-windows-essential-server/)