Receiving empty data from gprs module?
I think you'll need some further testing and debugging to determine whether this is a GPRS network and/or server firewall problem, or possibly a problem with your SIM card. Some suggestions would be:


Insert the SIM card into a consumer GPRS modem and see if you can connect to port 7869 on that server from a laptop or PC using the connection. A free program like Tera Term will allow you to connect to any TCP/IP port.
If you don't have a GPRS modem maybe try a cell phone and make sure at least you have basic Internet connectivity.
Instead of port 7869 try connecting to a well known port such as 80 on the same server.
Make sure you can connect to port 7869 from outside the network using a different Internet connection (home / friend's place etc) and once again a program like Tera Term may be useful.


Some mobile providers block lesser used TCP ports in unusual ways and if the connection looks OK but doesn't seem to arrive anywhere it might just be a problem with port  fowarding and routing on the server end.