unable to make vpn connection (pptp) in opensuse 13.2

hi,

i’ve set up a new pptp vpn profile in network manager but when trying to connect, nothing happen. see log below:
in Ubuntu linux, i was able to connect with the same configuration plus allow rules in firewall for TCP port 47 & 1723.
can someone help?

Thanks.

uname -a

Linux 3.16.7-29-desktop #1 SMP PREEMPT Fri Oct 23 00:46:04 UTC 2015 (6be6a97) x86_64 x86_64 x86_64 GNU/Linux

journalctl | tail

pppd[15395]: Script /usr/sbin/pptp 45.35.95.116 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-15394 finished (pid 15397), status = 0x0
pppd[15395]: Exit.
NetworkManager[988]: <warn> VPN plugin failed: connect-failed (1)
NetworkManager[988]: Script /usr/sbin/pptp 45.35.95.116 --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-15394 finished (pid 15397), status = 0x0
NetworkManager[988]: ** Message: nm-pptp-ppp-plugin: (nm_exit_notify): cleaning up
NetworkManager[988]: <warn> VPN plugin failed: connect-failed (1)
NetworkManager[988]: <info> VPN plugin state changed: stopped (6)
NetworkManager[988]: <info> VPN plugin state change reason: unknown (0)
NetworkManager[988]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
NetworkManager[988]: ** (nm-pptp-service:15394): WARNING **: pppd exited with error code 16

ok found the solution here https://forums.opensuse.org/showthread.php/507157-NetworkManager-pptp-doesn-t-work-after-lastest-update

load modprobe nf_conntrack_pptp, then it works …