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How to debug VPN Connection Issues (13.10)

rated 0 times [ 1] [ 0] / answers: 1 / hits: 14974 / 1 Year ago, wed, may 10, 2023, 10:53:29

I'm trying to connect to a work VPN, but every time I attempt to connect it fails. The VPN has been configured in the Network Manager UI and the connection is being started from there too. I have checked the system logs and see the following:

Jan 28 08:29:09 cwlt NetworkManager[751]: <info> Starting VPN service 'pptp'...

Jan 28 08:29:09 cwlt NetworkManager[751]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 6383

Jan 28 08:29:09 cwlt NetworkManager[751]: <info> VPN service 'pptp' appeared; activating connections

Jan 28 08:29:09 cwlt NetworkManager[751]: <info> VPN plugin state changed: starting (3)

Jan 28 08:29:09 cwlt NetworkManager[751]: <info> VPN connection 'VPN' (Connect) reply received.

Jan 28 08:29:09 cwlt pppd[6387]: Plugin /usr/lib/pppd/2.4.5/nm-pptp-pppd-plugin.so loaded.

Jan 28 08:29:09 cwlt pppd[6387]: pppd 2.4.5 started by root, uid 0

Jan 28 08:29:09 cwlt pppd[6387]: using channel 10

Jan 28 08:29:09 cwlt pppd[6387]: Using interface ppp0

Jan 28 08:29:09 cwlt pppd[6387]: Connect: ppp0 <--> /dev/pts/4

Jan 28 08:29:09 cwlt NetworkManager[751]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/ppp0, iface: ppp0)

Jan 28 08:29:09 cwlt NetworkManager[751]:    SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration found.

Jan 28 08:29:09 cwlt NetworkManager[751]: <warn> /sys/devices/virtual/net/ppp0: couldn't determine device driver; ignoring...

Jan 28 08:29:09 cwlt pptp[6391]: nm-pptp-service-6383 log[main:pptp.c:314]: The synchronous pptp option is NOT activated

Jan 28 08:29:09 cwlt whoopsie[1138]: online

Jan 28 08:29:09 cwlt pptp[6405]: nm-pptp-service-6383 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 1 'Start-Control-Connection-Request'

Jan 28 08:29:09 cwlt pptp[6405]: nm-pptp-service-6383 log[ctrlp_disp:pptp_ctrl.c:739]: Received Start Control Connection Reply

Jan 28 08:29:09 cwlt pptp[6405]: nm-pptp-service-6383 log[ctrlp_disp:pptp_ctrl.c:773]: Client connection established.

Jan 28 08:29:10 cwlt pptp[6405]: nm-pptp-service-6383 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 7 'Outgoing-Call-Request'

Jan 28 08:29:10 cwlt whoopsie[1138]: online

Jan 28 08:29:10 cwlt pptp[6405]: nm-pptp-service-6383 log[ctrlp_disp:pptp_ctrl.c:858]: Received Outgoing Call Reply.

Jan 28 08:29:10 cwlt pptp[6405]: nm-pptp-service-6383 log[ctrlp_disp:pptp_ctrl.c:897]: Outgoing call established (call ID 0, peer's call ID 42341).

Jan 28 08:29:49 cwlt NetworkManager[751]: <warn> VPN connection 'Fluency Labs VPN' (IP Config Get) timeout exceeded.

Jan 28 08:29:49 cwlt NetworkManager[751]: <info> Policy set 'VM529841-5G' (eth1) as default for IPv4 routing and DNS.

Jan 28 08:29:49 cwlt pppd[6387]: Terminating on signal 15

Jan 28 08:29:49 cwlt pppd[6387]: Connection terminated.

Jan 28 08:29:49 cwlt avahi-daemon[709]: Withdrawing workstation service for ppp0.

Jan 28 08:29:49 cwlt NetworkManager[751]:    SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)

Jan 28 08:29:49 cwlt pppd[6387]: Child process /usr/sbin/pptp xxx.xxx.xxx.xxx --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-6383 (pid 6389) terminated with signal 15

Jan 28 08:29:49 cwlt pppd[6387]: Exit.

Jan 28 08:29:49 cwlt pptp[6391]: nm-pptp-service-6383 warn[decaps_hdlc:pptp_gre.c:204]: short read (-1): Input/output error

Jan 28 08:29:49 cwlt pptp[6391]: nm-pptp-service-6383 warn[decaps_hdlc:pptp_gre.c:216]: pppd may have shutdown, see pppd log

Jan 28 08:29:49 cwlt pptp[6405]: nm-pptp-service-6383 log[callmgr_main:pptp_callmgr.c:234]: Closing connection (unhandled)

Jan 28 08:29:49 cwlt pptp[6405]: nm-pptp-service-6383 log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'

Jan 28 08:29:49 cwlt pptp[6405]: nm-pptp-service-6383 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)

Jan 28 08:29:54 cwlt NetworkManager[751]: <info> VPN service 'pptp' disappeared

I've deliberately hidden the ip-address here so don't worry about that. I don't really know what is going wrong here, so if someone could point me in the right direction that would be great.

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herriail

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answered 1 Year ago panshow · Accepted Answer

Now let me answer your specific problem.

as it seems there are some warnings in your log. I will try to investigate them one by one.

You have a line saying:

NetworkManager[751]: Policy set 'VM529841-5G' (eth1) as default
for IPv4 routing and DNS.

I assume that VPN should use tunnel interface instead of ethernet1. so please try unticking "use this connection only for resources on its network" in Network Connections -> VPN -> edit -> Ipv4 settings tab -> Routes.

Another line says:

VPN connection 'Fluency Labs VPN' (IP Config Get) timeout
exceeded

remove the wins entry from /etc/nsswitch.conf hosts line

Another line says:

/sys/devices/virtual/net/ppp0: couldn't determine device
driver; ignoring...

following this question It Looks like there must be a bug in libgcrypt11=1.5.0-3ubuntu2.2. After rolling back to libgcrypt11=1.5.0-3ubuntu2.1 things are working again...

sudo apt-get install libgcrypt11=1.5.0-3ubuntu2.1

I hope that saves you