iVMS4200 and VPN

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hi

1- i want to watch my farm remotely.

2- in my house i have ADSL connection .so i setup a PC with ivms4200 pcnvr and connected the IP-cameras to it and opened the ports 8000,554,80 and it works, I can watch the cameras remotely and using the WiFi .

3- in farm i have a 3g modem(GSM) and all the ports are closed. so I searched and found the solution to use VPN service,

so i subscribed with one company (witch dos not close ports). the VPN Clint is running in the PC.

 

when i test in my mobile the (ivms4500) it say it's connected but the screen is black, i can't see anything.

do any one have a solution or suggestion I can try.