There is no evidence of a bug here yet. You're getting logs reporting that the connecton was terminated because of a short read on GRE packets, and timeouts. I'd suggest looking at whether the underlying connections are properly established first -- for instance, wlan0 appears to be getting turned up while you're connecting to the vpn, so maybe the default route is changing?
Please see if you can add any additional information to this bug report. Thanks!
May 6 13:44:29 head pppd[19706]: LCP: timeout sending Config-Requests
May 6 13:44:29 head pppd[19706]: Connection terminated.
May 6 13:44:29 head NetworkManager[958]: <warn> VPN plugin failed: 1
May 6 13:44:29 head NetworkManager[958]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
May 6 13:44:29 head pptp[19710]: nm-pptp-service-19702 warn[decaps_hdlc:pptp_gre.c:204]: short read (-1): Input/output error
May 6 13:44:29 head pppd[19706]: Modem hangup
There is no evidence of a bug here yet. You're getting logs reporting that the connecton was terminated because of a short read on GRE packets, and timeouts. I'd suggest looking at whether the underlying connections are properly established first -- for instance, wlan0 appears to be getting turned up while you're connecting to the vpn, so maybe the default route is changing?
Please see if you can add any additional information to this bug report. Thanks!
May 6 13:44:29 head pppd[19706]: LCP: timeout sending Config-Requests 958]: <warn> VPN plugin failed: 1 958]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/ virtual/ net/ppp0, iface: ppp0) service- 19702 warn[decaps_ hdlc:pptp_ gre.c:204] : short read (-1): Input/output error
May 6 13:44:29 head pppd[19706]: Connection terminated.
May 6 13:44:29 head NetworkManager[
May 6 13:44:29 head NetworkManager[
May 6 13:44:29 head pptp[19710]: nm-pptp-
May 6 13:44:29 head pppd[19706]: Modem hangup