Hallo @kB!
Vielen Dank für Deine Antwort! Da ich vom gleichen Rechner aus vor der Neuinstallation noch auf das VPN zugreifen konnte, sollte es zumindest kein Problem mit der Firewall des Routers geben. Wie kann ich denn prüfen, welche Protokolle und Ports offen sind? Ich habe es mit netstat -pnltu
und netstat -antplF
probiert, finde da aber keinen Port 1723.
Hier ist auf jeden Fall der relevante Teil aus dem von Dir erwähnten Systemlog:
Okt 05 16:33:32 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908412.3209] audit: op="connection-activate" uuid="cf5ff8f0-77c2-4628-89e1-414f5776717a" name="PolyQuant" pid=1296 uid=1000 result="success"
Okt 05 16:33:32 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908412.3265] vpn-connection[0x55e52c05e300,cf5ff8f0-77c2-4628-89e1-414f5776717a,"PolyQuant",0]: Started the VPN service, PID 2001
Okt 05 16:33:32 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908412.3390] vpn-connection[0x55e52c05e300,cf5ff8f0-77c2-4628-89e1-414f5776717a,"PolyQuant",0]: Saw the service appear; activating connection
Okt 05 16:33:37 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908417.5596] vpn-connection[0x55e52c05e300,cf5ff8f0-77c2-4628-89e1-414f5776717a,"PolyQuant",0]: VPN connection: (ConnectInteractive) reply received
Okt 05 16:33:42 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908422.6040] vpn-connection[0x55e52c05e300,cf5ff8f0-77c2-4628-89e1-414f5776717a,"PolyQuant",0]: VPN plugin: state changed: starting (3)
Okt 05 16:33:42 florian-ThinkPad-T500 pppd[2013]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
Okt 05 16:33:42 florian-ThinkPad-T500 NetworkManager[2013]: Plugin /usr/lib/pppd/2.4.7/nm-pptp-pppd-plugin.so loaded.
Okt 05 16:33:42 florian-ThinkPad-T500 pppd[2013]: pppd 2.4.7 started by root, uid 0
Okt 05 16:33:42 florian-ThinkPad-T500 pppd[2013]: Using interface ppp0
Okt 05 16:33:42 florian-ThinkPad-T500 NetworkManager[2013]: Using interface ppp0
Okt 05 16:33:42 florian-ThinkPad-T500 pppd[2013]: Connect: ppp0 <--> /dev/pts/1
Okt 05 16:33:42 florian-ThinkPad-T500 NetworkManager[2013]: Connect: ppp0 <--> /dev/pts/1
Okt 05 16:33:42 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908422.6218] manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/5)
Okt 05 16:33:42 florian-ThinkPad-T500 pptp[2021]: nm-pptp-service-2001 log[main:pptp.c:353]: The synchronous pptp option is NOT activated
Okt 05 16:33:42 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 1 'Start-Control-Connection-Request'
Okt 05 16:33:42 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[ctrlp_disp:pptp_ctrl.c:781]: Received Start Control Connection Reply
Okt 05 16:33:42 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[ctrlp_disp:pptp_ctrl.c:815]: Client connection established.
Okt 05 16:33:43 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 7 'Outgoing-Call-Request'
Okt 05 16:33:43 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[ctrlp_disp:pptp_ctrl.c:900]: Received Outgoing Call Reply.
Okt 05 16:33:43 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[ctrlp_disp:pptp_ctrl.c:938]: Outgoing call established (call ID 8986, peer's call ID 42880).
Okt 05 16:33:44 florian-ThinkPad-T500 pppd[2013]: CHAP authentication succeeded
Okt 05 16:33:44 florian-ThinkPad-T500 NetworkManager[2013]: CHAP authentication succeeded
Okt 05 16:33:44 florian-ThinkPad-T500 pppd[2013]: LCP terminated by peer (MPPE required but peer negotiation failed)
Okt 05 16:33:44 florian-ThinkPad-T500 NetworkManager[2013]: LCP terminated by peer (MPPE required but peer negotiation failed)
Okt 05 16:33:44 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[pptp_read_some:pptp_ctrl.c:586]: read returned zero, peer has closed
Okt 05 16:33:44 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[callmgr_main:pptp_callmgr.c:269]: Closing connection (shutdown)
Okt 05 16:33:44 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 12 'Call-Clear-Request'
Okt 05 16:33:44 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[pptp_read_some:pptp_ctrl.c:586]: read returned zero, peer has closed
Okt 05 16:33:44 florian-ThinkPad-T500 pptp[2028]: nm-pptp-service-2001 log[call_callback:pptp_callmgr.c:84]: Closing connection (call state)
Okt 05 16:33:44 florian-ThinkPad-T500 pppd[2013]: Modem hangup
Okt 05 16:33:44 florian-ThinkPad-T500 NetworkManager[2013]: Modem hangup
Okt 05 16:33:44 florian-ThinkPad-T500 NetworkManager[2013]: Connection terminated.
Okt 05 16:33:44 florian-ThinkPad-T500 pppd[2013]: Connection terminated.
Okt 05 16:33:44 florian-ThinkPad-T500 NetworkManager[562]: <warn> [1601908424.1949] vpn-connection[0x55e52c05e300,cf5ff8f0-77c2-4628-89e1-414f5776717a,"PolyQuant",0]: VPN plugin: failed: connect-failed (1)
Okt 05 16:33:44 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908424.1999] vpn-connection[0x55e52c05e300,cf5ff8f0-77c2-4628-89e1-414f5776717a,"PolyQuant",0]: VPN plugin: state changed: stopping (5)
Okt 05 16:33:44 florian-ThinkPad-T500 NetworkManager[562]: <info> [1601908424.2000] vpn-connection[0x55e52c05e300,cf5ff8f0-77c2-4628-89e1-414f5776717a,"PolyQuant",0]: VPN service disappeared
Okt 05 16:33:44 florian-ThinkPad-T500 pppd[2013]: Exit.
Es scheint ab dieser Stelle schief zu gehen: LCP terminated by peer (MPPE required but peer negotiation failed)