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I'm trying to set up a VPN connection and it gives me the message "The VPN connection 'vpn' failed"

I set up the connection following the guidelines here: https://www.goldenfrog.com/support/vyprvpn/vpn-setup/linux/pptp

My /var/log/syslog says this:

Sep 12 16:38:52 abby NetworkManager[904]: <info> Starting VPN service 'pptp'...
Sep 12 16:38:52 abby NetworkManager[904]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 7374
Sep 12 16:38:52 abby NetworkManager[904]: <info> VPN service 'pptp' appeared; activating connections
Sep 12 16:38:52 abby NetworkManager[904]: <info> VPN plugin state changed: starting (3)
Sep 12 16:38:52 abby NetworkManager[904]: <info> VPN connection 'LA' (Connect) reply received.
Sep 12 16:38:52 abby pppd[7378]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.
Sep 12 16:38:52 abby pppd[7378]: pppd 2.4.5 started by root, uid 0
Sep 12 16:38:52 abby pppd[7378]: Using interface ppp0
Sep 12 16:38:52 abby pppd[7378]: Connect: ppp0 <--> /dev/pts/1
Sep 12 16:38:52 abby NetworkManager[904]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Sep 12 16:38:52 abby NetworkManager[904]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.
Sep 12 16:38:52 abby NetworkManager[904]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...
Sep 12 16:38:52 abby pptp[7381]: nm-pptp-service-7374 log[main:pptp.c:314]: The synchronous pptp option is NOT activated
Sep 12 16:38:52 abby pptp[7390]: nm-pptp-service-7374 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'
Sep 12 16:38:52 abby pptp[7390]: nm-pptp-service-7374 log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply
Sep 12 16:38:52 abby pptp[7390]: nm-pptp-service-7374 log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.
Sep 12 16:38:53 abby pptp[7390]: nm-pptp-service-7374 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'
Sep 12 16:38:53 abby pptp[7390]: nm-pptp-service-7374 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.
Sep 12 16:38:53 abby pptp[7390]: nm-pptp-service-7374 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 7664).
Sep 12 16:38:56 abby pppd[7378]: MS-CHAP authentication failed: No matching user matching 'XXXXXX' found in the database.^J
Sep 12 16:38:56 abby pppd[7378]: CHAP authentication failed
Sep 12 16:38:56 abby pppd[7378]: Connection terminated.
Sep 12 16:38:56 abby avahi-daemon[952]: Withdrawing workstation service for ppp0.
Sep 12 16:38:56 abby NetworkManager[904]: <warn> VPN plugin failed: 1
Sep 12 16:38:56 abby NetworkManager[904]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Sep 12 16:38:56 abby pptp[7381]: nm-pptp-service-7374 warn[decaps_hdlc:pptp_gre.c:204]: short read (-1): Input/output error
Sep 12 16:38:56 abby pptp[7381]: nm-pptp-service-7374 warn[decaps_hdlc:pptp_gre.c:216]: pppd may have shutdown, see pppd log
Sep 12 16:38:56 abby pptp[7390]: nm-pptp-service-7374 log[callmgr_main:pptp_callmgr.c:234]: Closing connection (unhandled)
Sep 12 16:38:56 abby pptp[7390]: nm-pptp-service-7374 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
Sep 12 16:38:56 abby pptp[7390]: nm-pptp-service-7374 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
Sep 12 16:38:56 abby pppd[7378]: Exit.
Sep 12 16:38:56 abby NetworkManager[904]: <warn> VPN plugin failed: 1
Sep 12 16:38:56 abby NetworkManager[904]: <info> VPN plugin state changed: stopped (6)
Sep 12 16:38:56 abby NetworkManager[904]: <info> VPN plugin state change reason: 0
Sep 12 16:38:56 abby NetworkManager[904]: <info> Policy set '213 MP2' (wlan0) as default for IPv4 routing and DNS.
Sep 12 16:38:56 abby NetworkManager[904]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Sep 12 16:39:02 abby NetworkManager[904]: <info> VPN service 'pptp' disappeared

I notice the line saying "No matching user matching 'XXXXXX' found in the database.^J" however I know the credentials are correct as I am using them on my windows set up with no problems. I am a novice here and not sure what to try in order to resolve this.

Thanks

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