Dears, i've problem in the PPTP VPN. i configure the PPTP vpn with my local domain IP and i add my users then i configure firewall rules. and when i try to test it doesn't work at all and it gives me on the log the below error 2016:06:13-14:32:20 utm pppd-pptp[13270]: pppd 2.4.5 started by (unknown), uid 0 2016:06:13-14:32:20 utm pppd-pptp[13270]: Starting negotiation on /dev/pts/0 2016:06:13-14:32:20 utm pptpd[13269]: GRE: Bad checksum from pppd. 2016:06:13-14:32:20 utm pptpd[13269]: GRE: xmit failed from decaps_hdlc: Operation not permitted 2016:06:13-14:32:20 utm pptpd[13269]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7) 2016:06:13-14:32:20 utm pptpd[13269]: CTRL: Reaping child PPP[13270] 2016:06:13-14:32:20 utm pppd-pptp[13270]: Modem hangup 2016:06:13-14:32:20 utm pppd-pptp[13270]: Connection terminated. 2016:06:13-14:32:20 utm pppd-pptp[13270]: Exit. 2016:06:13-14:32:20 utm pptpd[13269]: CTRL: Client 154.118.42.233 control connection finished any suggestion thank you
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