OpenSuse 13.2 VPN Problems

I'm using pptp vpn connection to connect to my office. I've done this by creating a vpn connection in networkmanager-pptp. It used to work properly, but after recent update, it doesn't.
I've updated system to all new packages that are found by "zypper update" command.To make sure that vpn server is working properly, I used other distribution to test it and it works.But on opensuse it fails to connect and pppd exited suddenly with error code 16
 
I have seen problems reported that were related to using 3.18.x kernels, and 'nf_conntrack_pptp' module not being loaded.
The issue has been solved with the following command :

modprobe nf_conntrack_pptp