problema com pptp vpn no linux mint

Question

Eu tenho um problema conectando ao servidor PPTP vpn, eu configurei o gateway, nome de usuário e senha, também configurei apenas MSCHAP e MSCHAPv2 e permiti apenas o envio de pacotes echo ppp, mas ainda não consigo estabelecer conexão pptp.

Isso é causado por um firewall externo ou por alguma outra coisa?

Estou incluindo log e configuração.

Mar 24 19:42:24 adrian-Lenovo-Z50-75 NetworkManager[1257]: Using interface ppp0
Mar 24 19:42:24 adrian-Lenovo-Z50-75 pppd[5558]: Connect: ppp0 <--> /dev/pts/3
Mar 24 19:42:24 adrian-Lenovo-Z50-75 NetworkManager[1257]: Connect: ppp0 <--> /dev/pts/3
Mar 24 19:42:24 adrian-Lenovo-Z50-75 NetworkManager[1257]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: nm-pptp-service-5549 warn[open_inetsock:pptp_callmgr.c:352]: connect: Connection refused
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: nm-pptp-service-5549 fatal[callmgr_main:pptp_callmgr.c:134]: Could not open control connection to 147.229.148.14
Mar 24 19:42:25 adrian-Lenovo-Z50-75 pptp[5567]: nm-pptp-service-5549 warn[open_inetsock:pptp_callmgr.c:352]: connect: Connection refused
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: nm-pptp-service-5549 fatal[open_callmgr:pptp.c:526]: Call manager exited with error 256
Mar 24 19:42:25 adrian-Lenovo-Z50-75 pptp[5567]: nm-pptp-service-5549 fatal[callmgr_main:pptp_callmgr.c:134]: Could not open control connection to 147.229.148.14
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: Modem hangup
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 11 / phase 'disconnect'
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: Connection terminated.
Mar 24 19:42:25 adrian-Lenovo-Z50-75 pptp[5566]: nm-pptp-service-5549 fatal[open_callmgr:pptp.c:526]: Call manager exited with error 256
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: ** Message: Terminated ppp daemon with PID 5558.
Mar 24 19:42:25 adrian-Lenovo-Z50-75 pppd[5558]: Modem hangup
Mar 24 19:42:25 adrian-Lenovo-Z50-75 pppd[5558]: Connection terminated.
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: <error> [1521916945.0409] platform-linux: do-change-link[35]: failure changing link: failure 19 (No such device)
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: <warn>  [1521916945.0409] device (ppp0): failed to disable userspace IPv6LL address handling
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: <info>  [1521916945.0461] devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: <info>  [1521916945.0466] device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: <warn>  [1521916945.0471] vpn-connection[0x21085d0,cf2c44e4-68d5-4afc-aa6c-557dbe0fb63a,"VUT",0]: VPN plugin: failed: connect-failed (1)
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: <info>  [1521916945.0475] vpn-connection[0x21085d0,cf2c44e4-68d5-4afc-aa6c-557dbe0fb63a,"VUT",0]: VPN service disappeared
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: <info>  [1521916945.0636] devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: ** Message: nm-pptp-ppp-plugin: (nm_phasechange): status 1 / phase 'dead'
Mar 24 19:42:25 adrian-Lenovo-Z50-75 NetworkManager[1257]: ** Message: nm-pptp-ppp-plugin: (nm_exit_notify): cleaning up
Mar 24 19:42:25 adrian-Lenovo-Z50-75 pppd[5558]: Exit.

Obrigado Cumprimentos, Adrian Bardossy