PPTP VPN connects via NM but goes down during SSH connection

Posted by Andrea Olivato on Ask Ubuntu See other posts from Ask Ubuntu or by Andrea Olivato
Published on 2012-12-12T11:41:48Z Indexed on 2012/12/18 11:13 UTC
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Filed under:

networking

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network-manager

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vpn

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pptp

I setup a VPN PPTP connection via network manager and it connects correctly (I see the lock near the notification icon and the message "Vpn connection has been successfully...")

As soon as I try to perform any SSH connection via the established tunnel the connection itself goes down with the message "Vpn connection failed".

the SSH connection always fails at

debug1: SSH2_MSG_KEXINIT sent

I've looked into the system logs and this is the log

Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> Starting VPN service 'pptp'...
Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN service 'pptp' started (org.freedesktop.NetworkManager.pptp), PID 7093
Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN service 'pptp' appeared; activating connections
Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: init (1)
Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: starting (3)
Dec 12 12:25:00 ushuaia NetworkManager[1155]: <info> VPN connection 'Redation' (Connect) reply received.
Dec 12 12:25:05 ushuaia NetworkManager[1155]: <info> VPN connection 'Redation' (IP4 Config Get) reply received from old-style plugin.
Dec 12 12:25:05 ushuaia NetworkManager[1155]: <info> VPN Gateway: 5.98.141.210
Dec 12 12:25:06 ushuaia NetworkManager[1155]: <info> VPN connection 'Redation' (IP Config Get) complete.
Dec 12 12:25:06 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: started (4)
Dec 12 12:25:14 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: stopping (5)
Dec 12 12:25:14 ushuaia NetworkManager[1155]: <info> VPN plugin state changed: stopped (6)
Dec 12 12:25:14 ushuaia NetworkManager[1155]: <info> VPN plugin state change reason: 0
Dec 12 12:25:15 ushuaia NetworkManager[1155]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active.
Dec 12 12:25:20 ushuaia NetworkManager[1155]: <info> VPN service 'pptp' disappeared

Please note that the same vpn is configured on my colleagues Windows 7 and works without problem when they use putty to connect via SSH

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