[WD/WM] Socket server

Hello all,

My app makes use of socket server, it will send a picture from the mobile device to the desktop. It is practically the same as the Socket server example from Windev. This works perfectly for all of my clients except 1.

I can not really identify this problem because this only happens on 2 of the 5 desktops.
Info:
- They are in the same subnet
- Firewall is off
- Virusscanner is off
- Exactly the same machine's (HP Prodesk)
- Same network/WiFi router

Has anyone a suggestion of what might be the problem or did someone encounter the same problem? Or how I could test what the problem might be. All help would be really appreciated!

Thanks in advance,
Rik