I'm not very much into networking, so my question might be quite dumb.

I have made a controller for a datalogging application that uses TCP/IP 
to allow the logged data to be transferred to a connected computer. The 
IP address of this controller is To retrieve the data via 
the local network, I have used the TWSocket component (cbuilder 1), set 
the address to (PC address, port to 10000 
(which is used to transfer the data) and this appears to work flawless.

Now we try to get the data into a different network (IP 192.168.0.x) 
using VPN, but TWSocket can't connect. The VPN connection is working 
OK, and the controller responds to a PING from this network over the 
VPN as well, but nothing happens with my TWSocket application. Port 
10000 is open on both ends of the network firewalls. Where should I 
look for to troubleshoot this problem?


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